Hi, Iona.
Figuring how to handle all this can be confusing for sure! But you know what? Everyone starts out that way :)
Before I get into your question, though, I do want to mention that you don't say if you like this guy. Do you? While it's flattering when someone tells you they like you, it doesn't mean you have to like them back, in a romantic way or otherwise. It can be awkward if you don't like him back, but it's important to be honest. Of course since you just met him, you may not know yet. It sounds like you're maybe starting in a new school? If that's the case, then there will be lots of new relationships to be made! Boys & girls, romantic and not! In any case, there's no rush. Enjoy the newness, all the new friends, classes, clubs. No need to restrict yourself to one boy so quickly. Be friends, eat lunch together, chat, have fun.
But when you do think you're ready, it's important to be comfortable in what is happening, that you're going at your own pace. If he doesn't understand that, is he really someone you want to date. Honesty is always the policy - it's true!
Last note, reconsider taking to your parents. You don't say why you don't want to talk to them. I used to feel the same way, and I was so wrong. And I'm really glad I decided to give it a try. They just might surprise you.