I dont know?
Answers: if you're unsure then you're unsuspecting, you'll know when you are!
Its up to you but you should ask yourself are you old and develop enough, are you prepared for an unintentional pregnancy or an STD if your going to have sex use a condom every time! to be honest if yo dont know if you are all set then you are not. I dont know how older you are, but even if you are over 18. the time will come dont let preasure give somebody a lift over. wait as long as you want, lug your time or you will feel ashamed and guilty
It shouldn't be something you own any doubt in. When u are prepared, u will know. You'll just have a feeling mentally ready (and physically too, i guess but that's not what matter!)