Inn to be an uptight snob

I came across the term recently and I think it describes me, perhaps due to my upbringing. However, a part of me thinks that it is surely normal to have social standards. I don't understand how I am supposed to accept the inappropriate behaviour of others. I am a loner because of this frustration - most people disappoint me, and the others are probably 'out of my league'.
The funny thing is, I also feel inferior to everybody - I am very shy. I think I sway between feeling inferior and superior - feeling like there's either something wrong with me or with everybody else.
I very much want to change myself - if only I knew how.