I think I need help.., Do I need zoloft or something? Options

[monkeywrench]

I think I may be one of those people who needs to have an antidepressant to be happy, or maybe I've got the permanent teen-blues. Heres my problem, there are things in life that make me happy, but most people could care less either way (I think).

Things in life that make me happy: being in a stable relationship (having my guy tell me he loves me and all), adjusting to a new envrionment (everytime I changed schools in my academic career), making new friends, purchasing material things (you know how that is- ie, 'ooh wow! a jumbo pack of coloring pecils!'), driving a different car for a day (like driving my mom's Cougar to school one day)

Things in life that make me sad: being single, finally having been used to my 'new' environment, finally getting used to a car and seeing one on the road that's totally awesome, seeing other couples make out wether or not I'm with someone,

I've recently figured that the reason Im so harsh on myself (thinking of myself as a worthless piece of trash) is because I want to distract myself from something else that bothers me more. If you looked at my family, there's no real reason for me to get down on myself but I've done it forever and I can't stop. If I've been happy for maybe a week straight and something gets me down, I stay down. Is it like I need to learn to like myself? the only times I do, are when someone likes me or when I do something good and get praised for it. Also, when I think about stuff, I think really hard about all possible outcomes and take them to the harshest level and take that as my answer. Since I was little ive been picked on for my family's financial status or my height (I'm 17, 85lbs and 4'11''-the doc said im healthy).

What do you think? Am i messed up and need help or is this normal for a 17 year old?