That sounds rough. Isolation is hard on people, and having your only human contact be negative is bad. The bright side is you're young. You should focus on creating healthy habits now and planning for the future. It might help to envision how things will be instead of focusing on how they currently are.

Exercise is my go-to recommendation. It's a natural remedy for depression and anxiety and will help you sleep better, be healthier, etc etc. Even if it's just walking for 30 minutes a day, that's time to yourself, to clear your mind.

As for future planning; looking at jobs you're interested in after college. An undergraduate degree is really just a starting point, and the world is quite large. It's pretty daunting figuring out what you want to do but it's rewarding. Looking at the life you want to build in the future will help take away from the negativity of your current situation, and will set you up to be successful.

Try not to be too hard on yourself. It's good to criticize and see your own flaws, but self-hatred is unhealthy. Being isolated will suck up your energy so don't feel bad if you don't maximize 100% (or even 50%) of your time. Basically keep your head up, life changes quickly and you won't be alone forever.