Heightened self consciousness is considered idealistic by plenty but to find negativity in that means that you most likely have a warped view of yourself.
You can either change yourself if you want to suit expectations, find more in-generally accepting persons or ignore them and realise that there is plenty of people like you in the world and everyone is unique in some respect anyway (nonetheless, we all have some form of "mutuality"). I agree with WingedZephyr on the expression of confidence but try to make sure you compromise this as you can also feel a little awkward if you start to act against your own personality especially if its a sharp change from what others recognise you as normally. I wouldn't recommend laughing what they say off too much, either, it can convey false apathy in my experience which can trigger passive anxiety and the illusion of ignorance and sarcasm to the situation. It'd actually be better to ignore completely while you can and since, say, "bullies" (or just highly-opinionated persons) like to get out an emotional response that means if you give them no response they will start disregarding you completely and while that may sound negative it's for the best because that means you can then keep to your friends and/or go ahead making new acquaintances/friends instead of among people who don't like you or some aspect of you just to get a sense of respect, a "niche" if you will. How you are on the inside is also a big player, you only usually get what you give, as long as it's in regards to those who aren't just taking materialistic advantage of you, you got to present yourself as a character (not necessarily through being out-going or making oneself strongly obvious, just your own sense of personality) that people would miss even if you don't share mutual appearance or interests with everyone.