My boyfriend thinks i always cum when we have sex

Basically i noticed when me and my SO have sex i don't always come. Anytime i do it is usually when im on top riding but i really don't like that position because its tiring depends what mood im in. Basically what i realised when we do have sex in any and every position he alwayss asks me are u about to cum babe and i sometimes say no and most times yes. I feel bad sometimes because i have faked orgasms before (also its not that im not attracted to him i am and i do orgasm BUT IN MY OWN TIME) anytime i do say yea im gonna cum he starts going faster n i feel even more bad because he works harder to please me as in he alwaysss wants to make sure im satisfied and i love that. But i feel bad

Im 20 btw his 21 & we've been together for 2 and a bit years. This issue only started when we made 1year. btw my point is i just feel bad whenever he asks me am i about to cum because he asks me ALL the time. I need help how to i orgasm more? Lol

Or how do tell him that im having problems cumming & him constantly asking me is pressurising me??