Someane can help me to review a paragraph

Correct age

Dating at early age should not be allowed for teenagers. I believe eighteen years is an adequate age to start dating for three reasons. Firstly, at eighteen young people have enough maturity to handle a relationship. Consequently, they are capable to of identify identifying those bad actions which can stop effect their future, such as or becoming pregnant and having sex at a young precocious age. ; It is also more common in adolescents,  who experience early puberty. Given the increased risk of contracting STIs and/, increased sexual activity is no trivial concern. Secondly, when tweens and teens become involved in romantic relationships, they often neglect their studies. It has been found that as adolescents become more involved in dating, they become less involved with studies. Trading off time with one for the other. In fact, 80% of adolescent girls in relationships spend less time studying than with their boyfriend. In addition, adolescents, who are dating may miss out on key social and emotional development that takes place in the (need a noun). As a result, I believe teens should have to wait until they are older for a major age. Thirdly Finally, adolescents in romantic relationships tend to have more mood issues than single adolescents., For example, such as, mood swings tend to be more severe for tweens, and symptoms of depression are more common among dating adolescents than among those who are not dating. So that symptoms of depression depressive symptoms are especially likely to occur surrounding break-ups. In fact, among adolescents who develop major depressive disorder, a break-up is the most common event that sets off the disorder. For these reasons, I consider the ideal age to start dating for teen is to be around eighteen years old.

I'm not an English major, but I hope this helps :) Great job expressing your point of view! Don't be affaid to use periods to avoid long run on sentences.