Is my boyfriend not attracted to me?

So my bf and I have been together for 4 years. We are in our mid 20s. I have seen porn on his phone and it doesn’t bother me that he watches it cause I watch porn sometimes as well. But I have noticed he always watches MILF porn. Also one time we broke up and afterwards I found out he was on an app to talk to older women.

Now I am 24 and i look younger than my age. I am short and thin and people always tell me I look like I’m 17-19years old.

It seems like my bf is really attracted to older women so I’m insecure cause I am younger and look younger than him.