How to stop being desperate for a relationship?

I'm so sick of feeling desperate to finally have a real relationship and feeling like a loser because I'm one of the few people my age (that I know) that have never been in one before...
And yes, I've tried to get one. Many times actually. So far I've told each of my past crushes about my feelings for them and I've been rejected every single time.
Meanwhile it just seems ridiculous to me how easy it is for some people to find a new relationship after one didn't work out while I'm apparently destined to be single forever.
All that I really want now is learn how to move on with my life and just accept my "fate"...