Note about anatomy: People often use the term vagina to refer to the entire female genital region between the legs—but this is not accurate.
Below is the vagina: the tube that connects the vulva (the outer portion, that you can see) to the cervix (at the base of the uterus):
Why does vaginal sex hurt for me? I don't have any STIs.
Some people experience pain during vaginal sex because the vagina isn't lubricated enough, leading to friction and discomfort. One thing to try is adding more foreplay into your sexual activity. Foreplay refers to kissing, rubbing, stroking, and/or touching that leads to sex. It can prolong and/or increase sexual excitement and pleasure. The vagina naturally releases fluids to lubricate itself when a person is aroused. Sometimes, however, it's necessary to use more lubricant. You can buy lubricants in the same place condoms are found at grocery stores/pharmacies. Remember that if you're using condoms, only use water or silicon-based lubricants (not water-based).
Should I wash my vagina?
Nope! The vagina cleans itself. Using special soaps or other products can disrupt the normal balance of bacteria in your vagina and can lead to things like yeast infections or bacterial vaginitis.
My boyfriend ejaculated right next to my vagina but not in it. Is there a chance of pregnancy?
Pregnancy is possible whenever sperm comes into contact with the vagina (the tube that connects your vulva to your cervix--see diagram above to distinguish between the vagina and vulva). If there was a chance that sperm came into contact with the vagina, then there would be a risk of pregnancy. It sounds like in this situation no sperm went inside the vagina, which would mean pregnancy is unlikely.