Pro-tip for geeks: If someone asks you to dance, You. Say. Yes. It's usually doesn't matter if you don't dance well. Go out there. Have fun. It'll be fine. :)
(Written from a privileged heterosexual male geek perspective... I suspect that others might evaluate my take as pushing the innocent towards reckless endangerment)
If you stop yourself from doing things because someone might think you look silly, then you're going to end up living a very dull life.
And if it does happen then embrace it, if you own it then no one can make you feel bad about it.
What I've learned about social skills is that recovering from your mistakes confidently, usually by being the first one to point them out, take a jab at them, or ignore them (unless they impact someone else then apologize and move on), is the #1 social skill.
By acting awkward about mistakes you make others FEEL awkward and that's what causes social rejection/teasing (not bullying that usually is different).