You have to stop caring so much about whether people think poorly of you. That’s easy to say; not so easy to do. I kind of think of it as not caring if I make a fool of myself. It took me fifty years of living to get to that point. And even so, I keep on reverting.
Despite that, I am fairly comfortable dealing with new people. Part of that is the training I’ve had. Sales training. It’s easy for me to talk to people about something I’m selling. Not so easy if I’m selling myself. I can sell myself to get a job, but if it’s just me, I am assailed by doubts that anyone who doesn’t already know me would actually be interested in what I say or think or do. Except for fluther, this seems to be fairly true. But let’s not think about that.
One trick I’ve used is to make fun of myself before other people do it. Or I point out my shortcomings before others figure it out for themselves. Most people think that one should not think negatively about oneself, or present oneself negatively, but I’ve found it to be a fairly effective technique.
If you do it with humor (well what can I do?) and not pathos (poor me), people don’t seem to mind if you diss yourself. Sometimes they actually get interested, oddly enough. Those tend to be the weird ones—the interesting ones, which is good, since you really don’t want to waste time with boring people.
Another thing I would recommend is for you to take a long term view of this. I mean, my God! Look at me? Not figuring this out until I’ve entered my sixth decade?!? You, at least, have the benefit of my advice, and should be able to deal with this by the time you’re forty, at least ;-)
Actually, I became more extroverted earlier; it’s just that I stopped taking myself so seriously around the time I turned fifty. It’s too late, now, to do anything about who I am. Might was well just enjoy it.
You’re only 17. Cut yourself a break! You’ve plenty of time to learn. Another thing that helped me was college and in particular, making friends at college. I found a group of people like me, and that made me relax more. I knew they were all just as geeky as I was, so no one could say they were cooler than anyone else. We were all so uncool, you could have friend an egg on our foreheads.
Nowadays, I can make fun of being uncool. I am about as far from cool as anyone could be. My daughter just laughs at me. I’m utterly hopeless (although, after looking the peoplefromwalmart pictures, I don’t feel that I’m utterly hopeless—just pretty hopeless). Anyway, I dress straight and talk straight and I no longer try to be cool, nor even, really want to be cool.
It’s all kind of relaxing once you stop trying to get people to like you or to entertain them. It’s relaxing when you give up on being an extrovert, and just accept yourself as you are. Oddly, often times when you relax about it, it become easier to interact with others. Still, at your age, you still care a lot, most likely. It’ll be hard to stop caring. I guess you have to go through that until it stops. Good luck!