As a guy I can think of two good reasons why guys are approaching you:
1) Your attractive physically
2) Your have a friendly/non-threatening demeanor
Suggestions:
1) Try to keep your appearance simple. (As a guy I’m not so sure what this entails, but I guess you do). Don’t wear strong scents
2) Be emotionally distant to guys. Always. Do not smile at them. Do not talk that to them, if possible. Do not give eye contact, even when you have to speak to them. These are actions that ladies may do to be polite, but are misconstrued by men, who think “she likes me” or “she’s wants to flirt”.