I think what you're going through is perfectly normal for XXTJs, but especially EXTJs. It just seems to be a natural defense against showing your vulnerable side to the wrong people (that's how I see it). I can relate, in being an Fi dominant I can pretty easily get in sync with people and their feelings and such, but I'm afraid of showing that logical side to them until I'm confident enough around them.
The only time I'd say that this is a major problem is if you aren't showing this inner child to anyone, to over protect it. You don't seem to have this problem though (be glad). If the girls you are meeting don't appreciate the initial self you present then they probably won't like you anyway.
To more readily express this side I think you should be more trusting. Make more judgments on people, what I do is I try to see if the person would be judgmental or not toward my logical side, if I make that judgment I'll usually try it out. I'm not going to get harmed, and if they attack my logical side (if I'm wrong about stuff and they attack me, this is my main fear around this side of me. Inferior Te

) then I just simply stop associating with them soon after. But most people that I judge as being trustworthy for this side are trustworthy, I've gotten more accurate over time. If you could do something similar to this then that would be beneficial.
In my experience with ENTJs they do exactly what you do. They show me that logical side first, and then we have discussions over common interests. Then eventually we will open up to the other and trust the other. This is when I've seen the "inner child" come to surface, after we've had some good discussions and we can relate on a few levels. Also after they've decided that I'm not a failure of a human being

.
The people that you should stick by will accept you for who you are, so if you go about things the way you're doing them now then you ought to be okay. But if you learn to trust people a little bit quicker with that inner child side of yourself then you should be alright.
I hope I helped and that this wasn't just meaningless rambling.
