Hallow Dear,
Let me assure you that you have been misinformed.
Girl has a thin fibromuscular membrane called as
Hymen situated at the vaginal opening. It has a small opening in it through which the menstrual discharge flows. During first intercourse, this membrane breaks causing some amount of bleeding. This bleeding is very moderate and does not require hospitalization. In this era, in many a girls hymen is already ruptured due to the lifestyle. Cycling, climbing trees, athletics, sitting astride, etc. can rupture hymen. In them, such bleeding may not take place at all.
Due to apprehension, girls constrict their vaginal sphincters during penile entry, which causes pain. If you relax, the pain will be much less. Deep breathing with wide open mouth prevents vaginal sphincter contraction. Moreover, use of lubricants will make penile entry absolutely smooth and painfree. However, do not use oil-based lubricants as they area harmful to woman's genital organs. Use only water based lubricants like vaginal jellies.
By this way, you will enjoy your sexual life.
I hope this helps you.
Dr. Nishikant Shrotri