People are going to judge you no matter what you do or where you are.
Hiding yourself behind lies will may make some people like you more now, but it's more important to be yourself. I'm sure you've heard that countless times, but for a reason.
Maybe the cool friends you'll attract now will uncover your lies sooner than you think, and five years from now they likely won't be your friends anyway.
Just think about what kind of attention and people you want in your life, and how turning yourself into someone who is "richer" and "more sexually experienced" will really get you nowhere postitive at any time.
At your age it's hard to hold on to who you are as an individual, but lying and hiding will not bring you happiness or peace. Chose friends that are friendly are caring of you no matter what you wear or say, not the ones you have to impress with lies.
And lying about sex is actually pointless because it's all about the gossip. So what if a certain group thinks you had sex with some guy? Does that really make you better, in either their eyes or your own?
The most beautiful thing we can experience is the mystical. It is the source of all true art and science. --Albert Einstein