Trying top position

[Omut]

Hey everyone! 

I always wanted to ask someone if they had anything of this and if so how did they handled it: 

So I prefer being bottom, but not because I don’t like topping. It’s just when I tried a few times I orgasmed so fast I wasn’t even inside properly… and this makes me sooo embarrassed that I try to avoid it. 

It is weird cause I don’t cum quick when someone gives me bj for example. And I can hold it long enough during sex as well. 

But just the idea of my dick being inside someone’s butt makes me ejaculate so fast I hate it. 

Or there can be another problem - because I get nervous of cumming too fast i won’t get hard… 

My question is - is there anyway to fix it? I wanna be vers but it scares me that I will embarrass myself once again