Your English is fine! :-) 

I mean, it could be that you’re too tight, but generally speaking, your nerves are probably not helping either.  You’re probably tensing up while he’s inside and that can cause pain.  You need to remember to push out when you first take him as that should really help loosen things up. 

Let me know how that goes.  And if that doesn’t work, we’ll keep looking into other ideas!  :-)  You will be fine.  :-D

Kev