Well, for one thing you're not an idiot. You're here right now seeking some help and support because you're a bit down and out -- hardly the behavior of an idiot. For you right now, it's the belief in it that does the damage.

High School can be a bummer. What you're describing is similar to my own experiences. I was socially inept, nervous and had shocking self-esteem.

You have to realise these are feelings you can overcome - it does take effort. I know! You've got to push yourself a bit at a time. Do you have any friends or family you could confide in? I believe support is important so they can help you pick yourself back up when you start feeling down.

Remember you co-create your life with life... if that makes any sense. Is your belief that you're an idiot and socially inept causing you to pull back from others? Perception = Projection. I'm not saying it's your fault, I'm merely saying it helps to take a step back and look at your own actions in an objective light.

As for some other ideas: Counselling is a good option. Also, perhaps joining some social groups and clubs within the school would be a good catalyst to get the social juices flowing.

Take care and BTW - it's never too late to make new friends.