how to cum with my partner?

penetration feels great. i tend to be able to get there when i masturbate, but i feel like the way i do that is unconventional as well and i dont know how to translate that to my partner. im sure that clitoral stimulation is what i need to fully get there, and shes been trying orally and whatnot and it feels fine but i dont feel that tension building, and even when i “orgasm” on my own it feels really weak and not like… as big as people make it out to be. the only indication i have that i got there is the physical aspect that i can feel, but thats not a big thing either. i just dont know what im doing wrong/ looking for ways to improve? ? ? or tips on how to with my partner ?