Life is never easy. Nothing in it is easy. Unless you're born with a silver spoon in your mouth, life can be much of a hassle to find your calling and make a living. But, in this generation you need school to succeed. I would recommend for you to start seeing a professional licensed therapist/phyciatrist.
If you are autistic, you should already be in special needs classes. This does not mean you are "stupid" or "dumb as a bag of rocks", it only means you have a disability and face obstacles that other kids do not, therefore you need extra attention and assistance to succeed academically. Do not get down on yourself over things you cannot control. Its not worth it. For now, focus on succeeding in school and graduating. Your chances of finding a job increase after that. If possible try getting into college, or trade school once you are finished with school.
Im sorry bud, this is just how life is. Its not always fun or nice to you, we all have our obstacles we have to get through, and once we do, it makes us who we are today. Dont lose hope, i know how hard that can be. But there is always a new day waiting for you to tackle it.
I hope this helps your state of mind somewhat. Take it easy bud, dont stress over things you cannot control.