I feel so alone and isolated? help :(?

I obviously have anxiety/depression issues. I have a small group of close friends, but I still feel alone. I am in college, and as I walk through campus I see all of these unrecognizable faces and I am a small fish in a big sea. I spend a lot of my time alone because I do not have a license or a car, so I either stay home or go places by myself on the bus in my free time because I feel guilty asking my friends for rides, and I know it gets annoying cause I live out of the way. I have no one to help me get a license, and I feel isolated and forgotten. I hate making excuses for myself and being pessimistic but how can I get out of this rut?