I feel unlovable what do I do?

So I've had very bad luck with romance. Any girl I've confessed my feelings to rejected me, the one girl who confessed to me didn't really like me she just wanted a boyfriend in general, and then the one girl who said yes to my confession dated me for over a year just to break up with me last December and say we have nothing in common and don't get along and she wish she waited longer before dating me to get to know me better or in other words she regretted dating me.

I've reached a point in my life now where I'm happy with who I am, I'm proud to be me. I want to find the one who completes me, someone who makes me happy, someone who likes me as much as I like them. But its seeming like even though I'm confident in myself nobody is very interested in me...

I'm not sure what is wrong with me, I know I'm a little young to be acting all doom and gloom about this being only 19 but I feel my luck has been bad even based on that. I don't know if I'm just not attractive or if I'm boring or what. But I feel so unlovable and unwanted...