I need help about my autism and life

I am a 15 year old boy who has been diagnosed with aspergers, adhd and more i cannot remember, Im just here to ask if people are experiencing about what I am about to say and if they can help me out because life is very hard right now, so the main thing I notice is my anger, I can get very angry easily over nothing like someone eating food loud or someone being loud in general or someone who is disturbing me when I am doing something and when I get angry I can't control myself and I either keep it in as much as possible then release it at home or outburst wherever I am, when I get angry the first thing I want to do is to shout at someone, call them names, or hurt myself, I either punch something alot of times or more recently bite myself on the arm multiple times which leaves several bruises, the pain doesn't bother me its just where harming myself can lead like doing alot worse which i have almost done on multiple occasions, I also have alot of suicidal thoughts, one time I got a long rope like thing and wrapped it around my neck and pulled as hard as i could just to feel something but it done nothing as usual. The reason I am telling everyone who reads this here is because I am too scared to tell anyone in real life like my parents or anyone else, I just badly need help and i am clueless on how to get it so if anyone could help me who has experienced the same as me I would be very grateful.