Thank you for writing.
You may be very sensitive in your genital region so as you said, you wipe "too hard" and this can cause discomfort. Be gentle. Wash with a soap that is gentle on the genitals - Summer's Eve is one option.
This sensitivity should not be a factor in childbirth.
We cannot diagnose anything over the internet but mention this to your doctor on your next visit. In the meantime, wash yourself gently and advise your partner to also be gentle.