Am I undatable? I’ve been single for 5 years.

I'm a 21 year old bisexual male and I can't get a gf/bf to save my life. I'm a shy person and talking to people I like feels like the hardest thing in the world, I literally get so nervous that I start to stutter and sweat and don't know what to say. My social awkwardness makes it super hard to get dates and then even when I do get someone to hang out with me it's always awkward because I get so nervous and don't know what to talk about. I'm also short (5'5) and I honestly sometimes wonder if that disqualifies me from women. Overall I feel completely helpless and alone, I've been single for so long so that must mean there's a reason and something is wrong with me right? If I wasn't some kind of ugly freak then at least SOMEBODY would like me. I'm so tired of feeling unlovable but I've seen absolutely no evidence to show me I'm not so I think I'm just not good enough to be loved. How can I change this helpless situation?