I am also in my second year of college. I used to be really reclusive and have slipped back into that all-too-comfortable-being-alone mindset lately.
Do you struggle with making friends? I know I did. It sounds like you just need to
take the first step and everything should be good from there. It is my opinion that personal betterment requires relationships with other people, otherwise, what is the point of being on earth with them? If you were meant to be alone, you would have been born on another planet.
Living with your parents and having no car doesn't help. Where do you go to school? Is it an urban or suburban environment? Even having those limitations, make the best of it. College is about learning. Learning doesn't always mean learning from a book. And I'm pretty much preaching to myself right now so I will shut up.