smaller penis positions

I love my boyfriend so so so muc but he is a little bit smaller he's maybe about 4-5 inches which never bothered me but after being together for 8 months we finally had sex last night! It was good and it felt good when I rode him but when he's on top I can't really feel it... like I just am wondering what positions can we do that allow deeper penetration. I would ride him all the time because it feels good for me but I get tired lol ... please help???