No. If you're really bothered by your nose and your self esteem is affected by it, then by all means go for it (but make sure you take enough time to pick a qualified and reputable surgeon)...at least once you get it fixed, you won't be ruminating over the shape of your nose and you can take your mind off of it and enjoy life.
Unless you have body dismorphic disorder or mental issues which affect your perception of yourself, I have nothign against cosmetic surgery- that goes for both men and women.
I don't think it's weird. It's your body. Your face. If you don't like something about yourself, change it. Obviously you should refrain from going extreme and getting surgery after surgery, but if having a different nose would make you happier, I say go for it.