Posting for Attention

This has been an ongoing debate between my gf(20f) and I(21m) for awhile now. The latest argument about this led up to an eventual compromise to not post pictures online of herself that are too risque as well as not too often. While I personally am not too fond of posting in general, other than the pictures being a little too revealing, it never bothered me that she does and likes to. What does bother me is that she feels the need to post in order to feel good about herself. While it makes me feel like I'm not enough, I know that the approval of others is something different, and is needed for the most part. It's just not a thought process that I think one should feed into. I'm honestly just asking for some advice on this subject, to possibly ease my mind on it, maybe even her's. Plus, is it healthy to post pictures of yourself only to feel good about yourself?