If that’s what you think, you’ve got a lot to learn about making love! The penis doesn’t have to ‘break through’ anything, it just has to slip into the vagina. If the woman is tense, the muscles of the vagina can feel tight. If that happens, pushing hard is the last thing you should be doing. The vaginal tissue is very tender and can be easily damaged, which can be very painful for the woman.
Be gentle, take your time, and keep stroking, kissing and caressing until the vagina is moist enough for your penis to slip in without pushing. Then sex will be pleasurable for both of you.