i can open to any girl without a problem. my problem comes into play AFTER i approach them and contact them. i numbers like candy, but whenever i find an opportunity to hang out with them, they reply saying something like "no, i can't that day, i'm hanging out with my boyfriend". some of them even offer to post pone, but then i feel bad because i think i just got friendzoned. maybe they do like me, but just thinking about them having a boyfriend is a hard obstacle to overcome because this will show that i will have to prove myself better than him.

any tips? i also get uncomfortable to the fact that they have a boyfriend, is it ok to still hit on them?

Possibly friendzoned. It's hard to tell do you make any physical contact with them when your talking to them? Also if you do how do they respond are they drawing back from you or they're cool with it? If they're cool with it I'd say fuck it keep pursuing most likely she doesn't even care and cheats on him anyways unfortunately.