Yeah, it's maturity, man. Time to man up and grow up.
It sounds like you need better people to open up to, it's good that you're considering a girl to do so.
First thing: Do not open up to a girl UNLESS you have zero intentions of ever getting with her and you make that clear. If you want honest advice from her you have to friendzone both of yourselves from the start. Don't let it get awkward.
I would modify this slightly to account for a wider range of girls - Only open up to a girl to the extent that she has opened up with you. Some girls appreciate honesty, sensitivity, and candor, and letting her lead the way (and not following too far behind) will make her feel comfortable in opening up more in the future because it's a positive response and shows that you're listening.