Doggy style going wrong...

Okay. So in my past relationships I have always really enjoyed sex doggy style, the hair pulling.. Really just the intesity of it all. I've been in a relationship with someone who I've loved before we even made it " official" and I feel like one thing that were lacking is.... Our sex life. He has definitely been a trooper with trying new things, because it's obvious to me now, I am a tad bit more experienced with everything .. But my main question or I guess what I'm wanting / needing tips or suggestions on is.. Doing it doggie style. We both like it. But it seems to never work out. He won't actually be inside me but start going at it like he is .. Or he had trouble in general just getting it in. He says it's because I'm "too tall" but I don't see how that is an issue. I'll be honey. He is not the most well endowed man alive,  but that doesn't bother me or make me think any different. I just want our sex life to work and be as passionate as our " everyday" life.. Has anyone else experienced this ? Or have any advise ?