Im so sad i don’t know what ti do

I feel horrible I don’t know what to do
I barely fall in love. Last time I was in love was when I was around 12 years old, and I think I’ve fallen for someone again but they have a gf already. Im handling it pretty well and I genuinely think he’s best off with her anyways, but I can’t help but question my own self worth. The ONE time I fall in love, it’s with a guy I can’t even get. And not to mention that I have extreme social anxiety, so I can’t even talk to him.