I'm tired of being alone. Please help me?

I have already asked about this hundreds of times, but every time I feel reured, the negative feelings about myself come back tenfold. I want nothing more than to be in a happy, loving relationship. Every time I approach a girl, though, I get rejected. I've had a relationship once, but she dumped me after two months. And now, all I feel is this intense feeling of emptiness, solitude, and cold. I just want someone to love, and to love me. I get tired of going to bed every night knowing that there is no girl in my life. I know it sounds pathetic, but I actually feel so lonely to the point where tears actually come to my eyes. And on top of that, my brother is probably going to go out on his first date with a girl that he likes, while I'm stuck here lonely as all get out. How can I fill that gap in me? How can I feel whole again?