Hitting on someone is the first problem. Outside of a bar setting, you shouldn't be hitting on someone you would like to meet or date.
Talk to her, be yourself, be nice but too sweet, be confident but not a jerk. Ask others who may know her, what she's like. Look for someone you find attractive and someone even if you never had a chance in the world to sleep with, you would still like to have a relationship with. You have to accept that just because YOU want a relationship, she may not, and you have to let it go.
Lastly, have patience. Eventually you'll find someone who is open to a relationship with you.
Talk to her, be yourself, be nice but too sweet, be confident but not a jerk. Ask others who may know her, what she's like. Look for someone you find attractive and someone even if you never had a chance in the world to sleep with, you would still like to have a relationship with. You have to accept that just because YOU want a relationship, she may not, and you have to let it go.
Lastly, have patience. Eventually you'll find someone who is open to a relationship with you.