Yaois where the uke hates himself or has low self esteem?

I liked to know too ლ(´ڡ`ლ)

http://www.mangago.zone/read-manga/sweet_heart_trigger/

This?

it wasn't a particular manga but thanks! They have western names so I can't help but wonder if it was written by an american ^^

I wouldn't know if you've read it since it is somewhat popular so reccomending something that would have been read would be embarrassing. But there is another manga I think it fits your description. Negative Kun To Positive Kun is another manga where the uke is quite negative on themselves.