This might be so simple it seems stupid but still, I need help.How do I move on from

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This might be so simple it seems stupid but still, I need help.
How do I move on from people? How do I convince myself that there's "fish in the sea?"
Everytime I attach to someone, I see them as the be all, end all of my life. It's almost parasitic in nature, I suppose, and it's harmful to me. I get incredibly depressed over the smallest things about them, and the twisted part is that I don't even think I want to be with them.
My head is in such a whirl, I don't know what to do.