I've been in a long term relationship and my gf doesn't find me attractive.

I'm a 29yo man that is in a long term relationship with my girlfriend. We have been together for about 5 years and we have a baby. We are still living with our parents. We have no money. We don't have our own place. My gf doesn't find me attractive. I'm 6'1" but I'm very skinny. My gf is a 24 year old woman who has a big ass. She's a size 12/14. I think I'm ugly.