This isn't directed at the original poster or anyone in particular, just a general comment on 'society' and stuff.
Every year we get a few messages like this at tax time. It's such a common thing for young people freshly out on their own to not have a clue about these things when they are faced with them for the first time.
While I was lucky enough to have parents sit down and explain stuff like this, it seems many do not. I really wish schools in America would teach at least a one semester course on life stuff you're going to need. How to balance a checking account, set up a budget, retirement investing, taxes, renting/buying places to live, insurance, escrow, credit score... all the things every body has to learn to adult in the world.
I hate to say this cause I've taken so much math, but even if schools had to cut algebra or geometry in half to fit in a class like this in, I think it would be of far more benefit to the majority of students. You're 18, just graduating, if young adults don't even know how to do a basic tax return the schools are kind of failing in their main job in my opinion.
Again, not pointed at the OP, just a general thought.