Should i just stick to one role?

I feel so discouraged right now. I main ADC and my main character is tristana . I usually get fed well in game, snowball bot playing with her. I try to play ANY other role, and i go 3/6, 3/5, 4/9 and shit like that. Im just so tired of this. I tried JG amumu and im so bad it hurts to see me play. I ult wrong almost all the damn time, OUT OF PANIC. I can land Qs and ult in TF and get people fed sometimes but im so useless in mid and early game. I feel so lost in jungle. I usually go blue, wolf and red since smiting red gives the health then try to gank mid if possible. It just seems like i don't know what to do. It gets to the point were I HAVE to apologize for my bad playing recently. People tend to be fucking dicks and just call me an idiot. They tell me to gank but its usually when i have low health or mana and they still expect me to gank and it ends up being SO FUCKING SHIT! sometimes i tend to ult when i mean to press Q(have no idea why that happens im just an idiot at that point). And of course, by that point i cant even think clearly of how much i hate myself and then there's the whole fucking game(this actually happens in every role except ADC, usually). I don't even try support as the last match went so bad that i SWORN never to play support in my life ever again. mid might be out of the question as i always keep forgetting to buy wards, end up being camped, or i ult really badly as zed and then question why i did that. I do so many stupid mistakes that have no explanation and i don't even know why i do them i just fucking do, i just cant think at all. I cant make decisions either, takes me too long and they are all wrong. and top is just fucking boring and i hate it. I play Lucian sometimes and graves and i can do better with them though sometimes i actually do really well.

People get so mad, or so i perceive since most don't really say anything in chat, that i feel a NEED to apologize every game. It doesn't even matter if were winning, if i'm doing bad it feels like a loss either way. Usually if we ARE winning i try my best to get my shit together and stop raging at myself, but its just difficult. Sometimes it works though like it has when playing amumu. I cant seem to get myself out of that mentality most of the time sadly. This game causes me to rage every single day at least once, and if not at rage at myself doing something else. It just feels like god doesn't want to play any other role other than ADC. It got to the point were my friend and I were playing a game were i was zed and he said "just stick to tristana". Which of course was kind of a low blow for me since i was trying so hard to be versatile. The thing is i eventually get bored of ADC and want to jungle, but i have to REALLY think if i truky want to do it considering the only videos in jungling ive seen were from S3 and that if i really wanted to put up with all my failures. I don't even want to jg when i'm playing with friends because i know for a fact that im gonna piss them off and embarrass myself.