That's a lot to go through. I'm impressed that you still have a really good attitude about it. Sometimes it takes a while to get there, but if you have a whole summer, hopefully you can find acceptance. Good for you to take the time to be introspective and evaluate what you're feeling rather than just getting down because things are going the way you would prefer them to go.
I got injured years ago and have been dealing with it ever since then. I don't have visible scars like you (hopefully? we're still going for hopefully?) will have on your knee. But I do have damage that keeps me from doing all the things I'd love to do.
I've found that it's hugely important for me to constantly remember the things I have to be thankful for. If I don't, I just focus on, "Oh, I can't do this" or "I wish I could go there." When I'm thankful for even the little things, I'm much happier! There will always be people with more/cooler/better/prettier/fill-in-the-blank, but we need to be thankful for what we have so we won't miss out on life.
Thanks for the encouragement!
Wow, thanks to you @themanwithnoname, that is awesome commenting. I hear what you're saying, and again, thanks so much!