Am I depressed? Am I bipolar? Or is it just hormones?

Ok so ahead of time, I am only 17 so take it easy.

I know that I don't have the biggest problems in the world. But I have these times in my life that I feel like I am literally nothing. I feel like I cannot bother anyone with my problems either, because it will just make me sound like a whinny litte boy. At the start of my day I will be extremly happy. I get to school and nothing really changes. But by the time I am driving home, I feel like I hit an emotional brick wall. I literally drove home today with my head in my palm not listening to anything. At times I just want to cry for no apparant reason. And I will just line up every little thing that I do, have done, or may do wrong; and just sit there and think how worthless I am. But this isn't all the time, it happens only a couple of times a year. Even if I'm content with my life at the time. I am also EXTREMELY paranoid. At times I feel like everyone around me is just making one big joke at my expense. There are times when i over analyze literally everything. Wether it be someones sideways glance, to not texting me back. I will dwell on these little things and end up spending all my time trying to figure out what I can do to fix it, which ends up with me getting more problems for not doing what I am supposed to be doing at the time. I know this topic is not all that important, but i really just needed to see it in print infront of me...

Thank you Jamie. I have a problem with getting to a doctor. I have told my parents about it before and they did not believe that I was depressed, they just said I need to get out more. I want to know if I do have a medical problem but it is nearly impossible. And the counsllers at my school are practically non-exsistant. So I felt this would be my best course of action.

BB-
First off, welcome to HW & know that everyone's posts are equally important.
As for your question, if it's only happening a couple times a year, that sounds perfectly normal. Everyone has an off day (or off week) once in a while. Give yourself a break. If you need a few days a catch up on sleep, go for it. If you just feel bad & want to be alone for a little while, that's perfectly okay.
Depression is when you feel down most of the day, nearly every day for at least 2 weeks -- without any reason.
In regards to the paranoia, can you try giving that up for a period of time. Ideally, it would be for 30 days but if that seems too long, you could maybe start with 7 days. Every time you think someone is talking about you or trying to exclude you or whatever, just say the opposite. So, if you're thinking "John & Dave are laughing over there, they must be laughing at me" change it around to say "People laugh, but they aren't laughing at me. Laughing makes you feel better." Then try to find something to laugh at yourself (it doesn't even have to be that funny. Laughing in itself makes people feel better ;). See how that goes. If you're still struggling, maybe you could try talking to a school counselor or, if there isn't one, the school principal/assistant principal, or a teacher or coach. Since they know you much better than we do, they can give some honest feedback about what's going on &, if needed, maybe talk to your parents about getting you help.

Hope that helps! Take care!
Tirzah