Does he not find me sexy? Or am I over reacting

I sent my my boyfriend a picture of how I plan to get fit. I been wanting to build my muscles and get stronger.

He said he would have a boner all the time if I looked like that.

For some reason it hurt my feelings.

Like he finds women already built more attractive than me and that he would find me sexier if I was like that

I know I'm over reacting.

I just wish he would react that way with the way my body already is.