"I've done that! Of course the the girl I asked out didn't ever say no, she just went out with sumone else the next day. I have lots of female friends, and they all think of me as a "friend". And because of this people think I'm gay. O_o I dunno why, but they do."
That unfortunately, is usually a product of youth. Most young folk aren't looking for any kind of relationship and prefer to remain single and jump from one person to the next, perhaps not in a sexual way, but more in a way to try and have as much freedom as they can. I wouldn't worry about this too much, because as you get older, the people in your life will be seeking stability and actual commitment rather than just constant change for the sake of change.
Don't let other people define who you are, just continue doing what you enjoy doing, and growing as a person. Eventually, they'll see you for who you truly are.
Take care all.