Dude, you can still recover some of those friendships. I went through a phase during college where I alienated a TON of my friends, and that was on me. For a variety of reasons we don't need to expound upon here. I eventually reached out to them, made my apologies, and would occasionally check in and see how they were doing. A few of those friendships are repaired and growing again. I think that there's a tendency toward second chance for people who've recognized their shortcomings, worked on them, and then taken responsibility for their actions.