If you've just experienced a new interest, that's great, but I hope there's not a component of outside pressure influencing you. If that's the case, that may explain the difficulty you're having as well. Maybe you're just not into it.
I have an old friend who is that way. She never dated but one guy and even then, she would say that it just didn't seem right, although it was a healthy relationship. They ultimately broke up and she's been single and celibate her whole life to now, in our 40s.
It's good to explore the possibility and seek to fulfill curiosity and have some fun. Nothing wrong with pushing your boundaries and seeing what's good for you. I hope you're being true to yourself in it all as well.
The sexual flow will come to you if it's right. Be patient and relax and take your time. Baby steps. You have to crawl before you walk. Don't get too concerned with advanced issues with sex, and just be in that moment with him. Enjoy the experience and decide what is best for you.
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