How to Know...

So I just turned 16, and my flirt buddy and I have been talking about maybe actually going all the way now that it's legal. He's 19 and lost his virginity last year and is very sure of what he's doing. The two of us have been talking for just under six months and we've told each other exactly what we would do given the opportunity, so I know I want it but I'm unsure of whether or not in ready. I care about him emotionally, and I definitely want him physically, but how do I know if it's the right choice for me? He doesn't want to pressure me into anything and is so supportive, I just don't know.