I HATE BEING ON TOP! HELP

So I’ve been going out with this amazing for 6 months now and when I met him I only been with other 2 people sexually and it was always the same (missionary). Since I met him he kinda exposed me to this whole new world of sex lol. I’ve discovered so much about myself, including the fact that I don’t like to be on top just because I have no idea what to do 🤦🏻‍♀️. He’s very patient with me and everything but I feel like he’s always doing the work. Also I’m a plus size girl and idk if that has anything to do but when I get on top I’m clueless of what I’m doing and I get tired easily. Does anyone has any tips or suggestions??