I have read about a fat, flexible, middle aged lady in Austin, TX who teaches hugely popular yoga classes, showing by example that you do not need to FIRST lose weight and THEN do yoga. You can enjoy yoga as you are. I am sure she modifies exercises.

I do restorative yoga and in the past did yin yoga. The teachers are slim, but I do not see reasons for them to be of any particular shape, for these yoga styles.

This is too much now, of course. I hope you can DO yoga yourself for yourself now. Not teach, but do.

Hugs.