Good on you for getting yourself an appointment to see a gyno. It's essential you get regular gynecological checks now that you are sexually active.
Please tell your doc about the painful intercourse - docs can only help when they know all your concerns and get your full medical history.
For now, rest assured that what you experience is quite common for those first starting out intercourse.
If you had a hymen, it's possible that it takes a few attemots at intercourse to erode.
Secondly, have you given yourself rest between all these attempts? Very often, lack of lubrication can cause tiny abrasions that can take a while to heal. Trying intercouse again too quickly can then be uncomfortable. - SO give your genitals a break. In the future, make sure you are aroused and actually wanting intercourse (keep in mind that arousal works best the fewer things we have to worry about, i.e. when one doesn't have to worry about parents walking in or pregnancy) and team your condoms up with a good quality, water based, condom safe lubricant, such as Astroglide.
There is no such thing as "being tight". The vagina is a muscular structure that can accomodate things of a variety of sizes: pretty much any sized penis, a tampon, after lots of stretching even a babies head during birth.
Lack of lubrication however, and lack of arousal can cause you to feel too tight.
Having difficulty during your first few tries at intercourse is nothing to stress about and will not have an impact on your ability to give birth.
Hope this eases your mind for now. - However, please ask your doc about all this again, too, ok?
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