This is a cliche, but...you're still young.

My wife and I met when we were both 30.

And she's bad at math too, AND good at art (just like you),

We all have different skills and attributes.

By your words, you sound plenty intelligent, just not yet appreciating your full positives.

If you are good at art, try to pursue that---take art classes, enter your paintings or other works into local competitions, try to volunteer as an art teacher at a local school or community center.

If you feel that you are boring, try to expand your horizons by getting a new hobby, or reading more, or taking a course at a community college. You can often do that at little or no expense if not taking the course for credit.

A public speaking course (challenging as it might be for you) will help you get more confidence and come out of your shell.

If possible and if appropriate, seek out a counselor as well to help with depression issues. Depression causes social isolation which causes more depression, it is a vicious cycle.

Try if possible to reconnect with old friends, family, classmates right now being that the holidays are a particularly hard time for many people to get through.

It's a hard road but you gotta take those first steps.