The kind of things you're feeling are common symptoms of social phobia. A low self-esteem, lack of confidence, hyper-sensitivity, mild paranoia, confusion can all be parts of the overall feelings that make us want to avoid social situations. How do you feel when you are alone? I would spend hours and hours obsessing over my percieved social failures. Always trying to change myself and adapt to what I saw in others as "good" traits.
My failure to do so successfully led to deep depression. I could never perform to my own high standards. Don't spend 25 years in misery like I did. You are still young. Many years of feeling inadequate can do some serious damage. You can get help. Talk to a school counselor, a trusted adult if not your parents. If you're able, see a specialist. Not a general practitioner. Someone who knows about the particulars of what you're feeling. There are many treatments available. I use zoloft and see a therapist. Don't put it off. It's not likely to get better on it's own.
Keep coming and let us know how you feel

"This too shall pass...."