It doesn’t matter what you do. There will always be people out there who don’t like you. The crucial thing to remember, is that provided you aren’t being all kinds of horrible to them, the problem is theirs not yours.
We are all very different, and some people just won’t get on with us. We don’t like everyone we meet, so why should they like us? It’s hard to do, but if someone doesn’t like you, try and let it go. Don’t spend your life either hating or desperately trying please. It doesn’t work, and your life ends up the poorer for it.
Having said this, if a person is being unpleasant to you repeatedly, that’s a different story, as that is bullying and needs reporting. However, if it is simply a case of your not getting on brilliantly with a person in your circle, or someone you met last night, then don’t stress. Try and forget about it. Remember that life is short, and that you cannot control what people think of you. As long as you like yourself, and your friends like you, who cares if someone outside of that crucial group doesn’t think you’re all that?