mind sharing what you could have prevented?
17 months is a long time, and you'll be older and wiser by then. Whatever comes your way, you will find ways to deal with it, just as you did your first year with T1D, and your recent surgery.
Although college seems scary, for me (and I'm sure many others), it was some of the best times in my life. A time to be on your own, and really learn who you are, and what you can accomplish.
Whatever hurdle you are facing, just take a deep breath, consider your options and try not to make choices out of fear. You've mentioned many supportive friends and family, so seek them out for help. You don't have to do it all on your own.
You can and will be happy and energetic again.
Pushups are a good way to blow off steam when you are stressed out but, since you just had surgery, that's probably not gonna work. When I had surgery, the last thing the operative nurse said before I went out was "walk, you'll get better faster" or something like that and I tried it out, very tenatively at first, as my guts felt very unstable, but just around the block and I think it helped me recover pretty fast. The dog was really happy, being walked like 4x/ day. She's probably like "what the hell happened?" since then.