College is a good thing as it's a new start for you and you can put a lot of the past behind you. Being together with a whole new crowd of people makes it easy to be more open, but the converse of this is that, if you do not try, it can be one of the loneliest places in the world. So, practice in your mirror, smiling and saying 'hi, I'm X' and then think up a few basic questions you can ask to help you to get to know other people. I'm sure you know the sort of thing.
On the question of your suicide attempt, don't be tempted to tell anyone at all. Even if you make what seems to be a good friend, I wouldn't. Mental health professionals say we should, and many in society agree, but once the cat's out of the bag it can always be used against you. You can have the best friend in the world and that friend can change and turn on you. Just put it in the past, where it belongs, go off to college and enjoy it. As you get to know people you will relax.