Although I can't offer much advice since I'm not in your situation, I want to say you're definitely not a waste of space. I've seen you on the forums and you're a really nice person. Reading about what you're going through made me sad because you don't deserve any of what happened with the suspension or being made to feel like you're worthless.
This one incident isn't going to ruin your future, either. You didn't destroy property, start a fight, shoot someone, or anything like that. It was a minor suspension for something that someone else did that you shouldn't have even gotten. I doubt colleges will even be able or care to access this kind of information about students unless they have a decently long criminal record, and even if they can/do, it's one one-day suspension that at that point would've happened years ago and would be easy to explain if you're asked about it.
You said that Reborn is like a second family to you. Reborn is a very supportive place and I'm sure many people here feel the same way as you about it. If you ever feel like your school and family life are overbearing, you can vent here and you'll always find people willing to listen and give advice.
Is there any way you can fight the suspension? It makes no sense at all to me that your entire class was punished for what a few people did. Only those few people should be suspended. Whoever actually thought suspending the entire class was a good idea needs to be fired.