Ok I'll clarify,
Hes not fucked for sure. Hes just probably fucked compared to if he would have been adopted by a 25 year old with a stable job. The other big problem is its a pit. I love pits, my pit-german shepard mix died this summer, and he was a great dog. But pits need extra attention, and you have to go the extra mile to ensure they don't become a nightmare dog, and as a full time college student, i seriously doubt OP will be able to give that extra attention pit pups need. There isn't a 100% chance this dog will grow up into a shitshow, its just a much much higher chance than if OP would have waited a bit. I know hes cute now and harmless, but OP this isnt about you. You really need to think if you can be a good caregiver to that dog almost constantly for the first 2 years of its life.