For a 15 year old, it isn't necessarily abnormal. However - you are at the age that you should start seeing a gynecologist anyhow - especially since you are exploring sex.
About that - you seem to know very little about sex - taking a morning after pill because of ejaculation near your vagina is a bit over the top. I'd suggest asking your mom to get you to a gyno (you don't have to mention sex) and for you to spend some time on the internet catching up on sexual information. Here are some great sites for teens...
https://sexetc.org/
http://www.teensource.org/
http://www.scarleteen.com/