The girl "ontop"

Truth be told im no good on top, i tried watching porn and reading Cosmo for tips and tricks but i dont know if its me or him or if we; together just cant get a rythem. Its usually something we laugh off after trying but i still feel bad and i feel less than... i want to please him and he shouldn't have to do all the work, but im out of ideas, even the bj's are a bit repetitive but i get lock jaw ever since ive had my braces off so its difficult to get fancy... also i always get a runny nose, any tips?