Afraid to speak to boss

I know my boss likes me and the work I do. I want to ask him something…role redefinition and maybe a little promotion and title change for a position that doesn’t really exist in our structure. But I am scared to do it.
C – I want to ask boss for something
T – He will think I am being a ladder climber, lose respect for me and say no, think I am in it for wrong or superficial reason
F – Scared nervous doubting myself
A – Don’t ask him
R – Nothing ….same as now..feel frustrated

I know it’s my thoughts and maybe it won’t work out this way, but there’s a very high chance it will.

Maybe I should just live with things the way they are.