While I understand your frustrations, I have to agree with Shazerac that you're too young to be drinking. I don't want to sound like a stick in the mud but a 16 year old isn't an adult, there's no such thing as "almost an adult", either you're 21 and legally able to drink (as is the law in the US, where I assume you live), or you're too young to be doing so.

Until you are 18, you are legally known as a minor (aka a child) and are therefor under a parent and/or guardian's jurisdiction. It's not only their right, but their obligation to prevent you from making mistakes like drinking underage.

I also hope you're practicing safe sex. Getting STD's isn't fun for anyone.