Faking it🙄

Okay so I have been with this guy for 7 months and we have been sexually active (sex wise) since about the 3-4 month, now I usually fake my orgasm and I always have, I did in my previous relationship as well but I just don't know why! It's like I literally can't cum even if I run my clit but when I just run my clit I can cum, any tips? I don't wanna tell my guy I've been faking it bc it does feel good (great in fact) but I just can't seem to cum☹️ And I need help on how to not have to fake it