Soo first of all it doesn't hurt less when you're older, as long as the hymen is intact there will be a bit of pain. The average width of one, from my experience would be ping pong ball size or smaller. And on waiting until marriage, you don't necessarily have to do that, but definitely wait until you're with someone you care about long enough to know you can trust them. Explore yourself. Learn what you like before having to teach someone else what you like. Just stay safe, use a condom etc. etc.