Ohhhh it just seems like you're experiencing the same story as me!
I was always struggling my ex boyfriends to join me on dance classes but they were all so shy and introverted. I am deeply introverted, too; but I believe dancing is something really necessary for every soul. finally I choosed to do WHIRLING DANCE as you can do it all alone, and Im really enjoying that, but I wish soon my partner accepts attending swing classes with me.
wish you and myself luck!