You have nothing to worry about. The semen containing sperm have to enter your vagina and access the cervics in order for you to get pregnant. I am going to recommend that you do some research into what causes pregnancy so you do panic over things like this.
Agreed, nothing to worry about. You should also look into if you are old enough to have a boyfriend.
You are perfectly safe. Its impossible. Also I'd like to add. Since you have a boyfriend, it is up to you too weather or not you are going to have intercourse please be sure you are ready, it is a big step. If you do decide to make sure you take all the precautions necessary to be safe. 2 types of birth control is recommended as one can fail. Best wishes.