Getting on top !

Quick! I’m in the bathroom taking a shower and I just need some fast tips on riding. I really wanna try it out. The more I have sex with him the more comfortable I become but we only do missionary because I’m not ready for doggie and I’m new to this, so riding is also awkward for me. This morning we were having sex and I could see he was getting tired from doing all the work but also I felt the urge to ride him. I’ve never been straight forward sexually so this is all new to me. As a matter of fact I just only had sex for the first time a month ago. I’m 28 years old so any advice and tips are welcome. Also I’m having trouble having an orgasm through penetration. I do just fine with oral or if he plays with my clit while stroking. Anyway I’m getting off track here ! Please HELP! TIA ❤️