Best positions for beginners?

so when my boyfriend and i lost our virginity to each other, it was great but he seemed to get tired out rather quickly with missionary and kinda spooning (its not that he's out of shape, he's actually in really good shape) the thing is, im actually the one who is a bit out of shape tbh so we tried cowgirl and that was just kinda ehh. Any other positions or tips to help out with not getting tired out too quickly? thank you ❤️❤️