Is it? I didn't know that... well, good for you anyway for being accepted, and further good for you for not being pushed into doing something you didn't really want to do.
Some of these girls are fully nude, but don't show there pussy. Pretty much all of them show there boobies though. Thank God for boobies! If you aren't ready, don't do it yet. I guess I will just have to be patient, dammit! Good luck with your decision. I hope some insecure pisswilly boyfriend is not asking that you don't do it.
There's a lot of negative stuff out there on SG, such as the fact the site owners have been known to sell on your pictures to dating sites etc. IDK, you've got plenty of years ahead whatever you decide on, just try to be aware.