At Age 24 I Don't Have A Girlfriend, Have Not Been Loved By Any Girl

I spent four years in the university without a girlfriend, because am afraid to approach girls. I don't want to be rejected. people gossip about me that am gay. because am always in company of guys. even my male friends are even accusing me of been gay, which I know am not. The even joke with me with jokes like
I can't sleep in one bed with you and so on.

Now what I need is advice from Nairalanders on how I can get a girlfriend that can love me. Because very soon I will be going to national youth service. am depressed because of my situation I need help