I have never in my life had a single guy friend that didn't end up falling for me or trying to get into my pants. and i've had many many guy friends.
Why do you think that's the case, were you leading them on to fall for you?
I love all my guy friends, am used to them but I am very flirtatious and playful with them, but I think of them as cute little brothers. However, they always end up seeing me as a potential girlfriend! I don't know how to change this!
I can understand how frustrating that can be, but one constant in all of this is you. You shouldn't continue the pattern if it's causing problems for you or them. You should try to alter your behavior to break that pattern.
It doesn't bother me, but I'll keep that in mind.
I feel like it should bother you as you are hurting a lot of people if you are leading them on but just rejecting them in the end. You should be honest from the start and tell them you're not interested with being their girlfriend and make sure that you only are looking for friends.