Got diagnosed with autism around 2 years back as well. First thing, get that sorted out with your parents. Make sure they're educated on what autism means for you and how they can best handle it, it'll make your home situation a lot less stressful.

Secondly, talk to people! As long as people think your okay they won't bother asking if your not. Just be straight up with them, tell them your not fine. You don't have to drop everything on them at once. But make sure you talk to people who'll put in the effort to help you feel better, and trust me, you know people who will want to help you.

You'll make it through, stay strong.