He’s using you for sex and company, there’s no way around it. Up to you if you want to be in that kind of relationship.

A 37 year old man will never be interested in you beyond sex. You’re a teenager. And if they are interested, it means they never grew up and have the mentality of a teenager in an old man’s body which is even worse. This is not a man who you want to settle down with. Just leave him.

Then find a 20 year old guy to do that with. Not someone the age of your father that’s using you for sex.