Controling temper is most difficult.
I had battled this for few years, when I decided to completely get my anger under control. Now, I'm happy with the result where I am now (strongly reduced, very minimal i must say, before start coming out the fire, I mostly managed to stop the smoke by stopping giving reaction to my anger)
So when I start get mad, I stop
And take a deep breath & tell myself that anger not real, I can choose to be angry or not to b angry. If i getangry, im the one who will b hurt, the other person wint get affected, so for what we punish ourselves??
When start feel the urge, pain, heat, fire in my chest, I focus on that & keep breathing slowly, and just imagine take water and splash on fire & keep breathing SLOWLY & deeply to let it cool down. Another thing, when u are already mad, then u have to cool it down first.
Or talk about it to yr sis, maybe she understands & try to help u?
Just tell her u dunno why u r jealous of her only, but not other, wonder if u guys had history in the past/ PL
Btw. Sure u r jealous at her only & not to anyone else?
Well, my sis always talk about her, how the guys chased her, what happened at school. Well, I have nvr been disturbed because of that, I think I just really proud of her, thought that her life is so much more interesting than mine, so I like to hear her stories, I even keep asking her, "and then what happened sis, tell me more" i was really interested. Maybe that's how I switched my mind
U know, our heart have button, when u feel neg emotions in your chest, it's because u forgot to switch the button in yr mind. U have to reprogram "I'm proud of my sis, not jealous", then confirm & affirm it. It takes some time to reprogram
So when u start noticing your anger & jealousy arise, u have to catch it as fast as possible, stop whatever u r doing, just say excuse me, step aside, give yrself time and start keep repeating words in your heart "i'm proud of my sis, im not angry nor jealous at her" while focusing the burn in your heart, keep saying that until u notice the neg emotion cool down in yr chest.
And if there r things like games or topic of conversation that keep making u angry or jealous, maybe it's a good idea to talk to yr sis nicely not to talk about it, just ask her to help you change yourself. Sometimes, when u r honest, she would be happy if u tell her, and maybe she even reflect herself & notice that she's self-centered, so she might try to change herself too. Who knows
If it doesnt help after 1-2 months, u can try PL regression to find out, but if in the past u had similar situations, I doubt it u can do much, but only try to change yourself.
Oh before I forgot, before u sleep, when u go to bed. U repeat the sentence (affirmation) above, at least 7x with strong willingness. Each time u sleep, u r uploading datas to universal databank & leave the imprints there, by doing so, you will erase your unsatisfaction to yr sis on that day & uploading your new data. If on that day, u feel so much disturbed by her; then, u keep repeating the sentence until u fall asleep. Dont forget to do this EVERYTIME u r going to sleep or take nap. U will notice the change slowly. U can add more sentences for yourself too like "i'm PATIENT, i'm unique, i'm happy"
Remember not to fall asleep or go to sleep with anger, so cool it down first by watching positive film on tv, like comedy to give u a laugh & happiness
I use same method to control my anger. When your anger of the day gone, try to forget everything & rebuild new relationship with yr sis, good one. Dont avoid her.
U know, everyday we rebirth, when the night is over is just like we are dead, so just leave the baggage of the day behind, dont take it on the next day, feel that every morning is a glory & happiness for u, and everything starts new
when we r mad at someone, whatever they say might sound bad to us, so just say "sorry" to stop everything nicely, in yr case e.g."sorry, i dont know why I'm mad when u keep talking about yrself, as if im nothing for u. And then, u won the game & make me feel even more not worth. Something wrong with me, but I'll try my best to fix this" Just say sorry, then explain her nicely about yr feeling. If u try to build good relationship towards yr sis by being honest to her & try to change, she would try to step back to help u with this, like she might evtl. Have more interest to know about yr day, rather than talking about herself.
U should play something that is not competitive, play game that build friendship, and u should be in same team as her
Now, u regret of yr neg behavior, it's good that if u can go to her in private, ask her if she's busy, coz u wanna talk to her, first thing, tell her sorry for yr behavior, then in conversation should be telling more about your issue, emotion etc, NOT talking things that what u think wrong about her, nor things u dont like about her, coz if u say this, she might think u come to talk to her to blame/wrong her. Then, things get worse.
In case, she 's not interested in yr matter, then no problem. I think, not everbody likes everyone, but it doesnt mean u guys have to become enemies.
I recently had an issue with my bro, because of different opinions, but I dont want we fight nor become enemy. He was rude, used bad words towards me. I felt the pressure in my heart, so I told him, "because of such silly conversation we argue intensely, I think it's not worth, I wanna stop talking about it since we would never come to agree, so before things get worse, let's stop & forget everything & have a new start."
So once i told him this, i count case is closed, so I left all negs behind, I want to stay friends with my bro, so I keep trying to speak normal, always include him in family conversation. He actually ignored me, but now he just talked to me again. It's nice to have 1 more friend, then 1 more enemy. But if the person is difficult to be friended, then u dont need to hate, but just be friendly & respect. If u think, it's impossible to build friendship with sis, then u just dont keep looking for her, but not avoiding. I mean be normal like when u meet friends at school, not so closed but still try to b friendly
Good luck to u