So even if me waiting until I turn 18 means I'll miss the first semester of college, that doesn't count for anything?

When I leave, what can I take with me? I know I can't take my car because it is in my mom's name, but what about laptop? Clothes? Furniture? Am I allowed to take things that were GIVEN to me, but not purchased by me? Because I have paid for most of my own things but the things I didn't pay for, but take care of and use, can I take that with me as well?

Thank you for your help (: