Setting:
U.S.A Miami, FL
Age 19, College Freshmen

Situation:
I've been in only 2 Relationships, the previous girls were both bad they both had never kept a relationship longer than 2 months. My current & 3rd relationship I'm in now (although has it's own complications) has been the best, and the girl has been in a long relationship of her own before.

Her profile is HB 8.7, Tomboyish, Secret Nerd, Can dress sexy.

So my problem is in ->all 3<- relationships the girls have said I'm Childish, Like a kid, even Immature.....

1st Relationship it was ok, we were still in high school,

2nd Relationship it was ok, the girl I was dating was 2 years older

3rd Relationship wtf, 3rd time a girl has told me this and I'm in college, have a job, and she's my same age...

I don't know what to do about this, this is who I am, I am truly a kid at heart after all the PUA stuff in the beginning...

Every time a girlfriend or girl comes to this conclusion it eventually shortens the overall "attraction" (because they want a "man") in the end I feel like shit cause they imply I'm less of a "man" by acting like a kid....

Conclusion:
What can I do when my gf thinks I'm not a "man" when this is who I am
(I don't mean I'm a kid but it's just my mannerisms)
All in all I wanna act myself.....
What to do, Opinions???

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Assuming they are correct when you act like a child, you can grow up.

You're 19, you've probably got some growing up to do. That's life. If multiple women are telling you that you act like a child, either you are attracting a specific type of woman with similar issues of their own, or you are the problem. You can't claim to be a man, and act like a child. When you say this is me, if you are a child, then you cannot claim to be a man and not act like it. If you think your current gf is a good girl, and you want to keep her, when she mentions that you act like a child, ask her how, in what ways, and have her help you recognize when you act that way by yourself. This is a classic instance where a relationship can help you be your best self.

And chances are if you don't become a man, it is only a matter of time before she leaves you. Sooner or later she will meet a man, and want one of her own. Could me days, weeks, months, or several years, but it will happen sooner or later.

Okay I see what you mean in how I contradict myself, I can be mature when need be, when it comes to making plans and saving to pay bills I can be serious, but otherwise. Why should I change how I am to fulfill what society envisions as a "man", society has spoon feed this specific image of what a "man" is to females...

Life is too serious, I pretended to act like a kid so I can be mature inside, and have fun and be childish out, girls don't get this and think I'm all kid out cause my Manliness is Stealth....
I guess that's the problem lolz...

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You frame it very positively, thats nice. What are the childish things you are "pretending"?