If you've had unprotected sex over 300 times in the past 2 years does that mean your infertile?

No but: At 15 years old this definitely indicates you have a problem. The cdc defines high risk sexual behavior as 3 sexual partners in a lifetime. It appears you are engaging in very high risk behavior at a young age. Please seek help. Stds like HIV and teen pregnancy are potential outcomes in your future. See a doctor. Use condoms.

No: Unprotected sex, and fertilization must occur at or near ovulation to begin (with the injection of semen into your vagina). Secondly, there is the chance that the male involved may have fertility issues. If you do not want to become pregnant, unprotected sex is not recommended, and you should use birth control as well as condoms (to prevent sexually transmitted infections). Best wishes.

Not necessarily: Have the episodes of vaginal intercourse been timed with ovulation?

No, BUT!!!: The number of times alone intercourse occurrs is not a determinant of fertility. Many other factors play a role for both the woman and man. But, unless this question is hypothetical for the age of 15 listed above, this type of activity is extremely risky. Pregnancy at age 15 has increased risk and is a poor choice overall for the mother and child. Sti's risk is high including chlamydia and hiv.