I am sorry your first experience was so awkward like that. My guess is he is young too and probably isn’t all that experienced.

How have things progressed? Have you been able to be intimate again with him? Don’t just assume he has more experience than he does. Even if he isn’t a virgin he probably doesn’t know how to help you enjoy yourself so that can create discomfort. A first experience often hurts and many women feel strange afterwards as it’s not what they expected.