I Am 14 Years Old. I'm Not Ready For Sex

I am 14 years old. I'm not ready for sex yet, but I'm trying to educate myself because I haven't had sex ed yet. Inside the wall of my vagina is a big lump that goes from the entrance to almost all the way up. I can fit one finger in there, but it is very hard to because this lump is in the way. I've always had it but I'm not sure what it is, if it's normal, or what to do when I'm ready to have sex because it is in the way.