Is it normal that the rainbow symbol is used by homosexuals?

Certain groups have to have something that symbolizes them. I'm bisexual and I like the "rainbow", but I don't really care in a sense. They could've picked a dinosaur or a Phoenix for the flag and I still wouldn't have minded. However, I am now worried that If I wore rainbows that people might think that I'm gay, which I am not. I don't want to be judged because of the colors/patterns I choose to wear:/ I think anyone that wears rainbows might be labeled/judged as being something they're possibly not. It's like the Swastika. It originally was a buddhist symbol, but Hitler took it. Ironic isn't it? Anyway, it's now sadly seen as a symbol of evil and hate. A far cry from it's original meaning. Anyone who wears it, even if they wear it for the original meaning, will be labeled as a racist.

Gilgamesh... The hero from Sumerian legend or history. I really think the Sumerians were of universal origins. If you look at the features and drawing of their artifacts. The same goes with the Egyptians.