The bit about being left handed I actually find amusing. It's something that people often don't think about, but I've mentioned to some friends/family before that some people throughout history will hate you because you're different than the average "norm" no matter how small the difference, so just be proud of who you are. Don't let other people make you feel bad because you're different than they are.
For example the whole thing with left handedness is one of the original terms for it is "sinistral", because apparently us left handed folk are inherently evil and sinister. Some religious schools (not sure if it's still a thing, but probably somewhere), you'd have left handed people forced to use their right hand and their left hand would be tied down. Sometimes even beaten for it from what I've heard and read.
There are some people out there that are just stupid jerks about any aspect of you that's different than themselves, to which I say F'em. Just be you and don't stress about the people being jerks.