Making decisions while depressed is hard, for sure. Depression can be treated, even if if is due to diabetes. If you can talk to your dr about getting some medications or counseling it really might help.
Also, as an aside, being 19 and way from home for the first time is very tough. It was really hard for me, and would have been harder if I had diabetes then (I got it later). I ended up transferring colleges and was very glad I did. For me that was the right choice. But whatever you decide, know this things will get better in the future, you are just in a hard place right now.
I read a book that I would definitely recommend, called “Beating the Odds” by Richard Vaughn. I recently read it and it really gave me hope. The author has had diabetes since he was little (6 I think) and now he is 70 or more and I don;t think he has any complications. Amazing story. He is also a member here, BTW.
Yes, your life is and will always be a little different because of diabetes. But yes, you can have a normal happy marriage, healthy kids and the whole deal. You may be a little more mature right now than your peers, but don’t worry they will catch up. The drinker and potheads I knew in college are now successful adults (at least for the most part) who gave up their partying ways long ago.
You wil find friends you like and a true love. It just takes time. Focus in just treating yourself well and being the best you you can be.