Horrible sex

PLEASE help give some tips my new boyfriend is not so great at sex ieam like we went 4 "Rounds" in about 20 minutes. im 5'5 hes about 6'9 with a small dick. its big width but length its small when i get on top i cant do much or it will come out. then he will get on top go for maybe 5 mins pull oit so he doesnt nut then say ready for another round. Hes amazing sweet guy but sex is a no go.