For starters, I have been there too; screwed up college, relationships, life, everything big time, BUT that was 44 years ago. Now a retired engineer. Relationships still semi-crap, have PTSD now & AS, of course, but did get a college degree and have a relatively good career. After the initial college fiasco and several disastrous relationships, I moved far away from home, cut all previous personal relationships including family, got a job and basically became a hermit for a few years trying to get my head on straight. Ultimately, I went back to school and got a degree and an engineering job.
The most important thing sometimes is to distance yourself from your old life, both physically and mentally, and to give yourself a fresh start. This doesn't solve everything, but sometimes it helps.
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"A man needs a little madness...or else...he never dares cut the rope and be free."
Nikos Kazantzakis, ZORBA THE GREEK
Some of us just have a little more madness than others!