Is this normal?

Ashley

I’m always always always late for my period. I’m a virgin. I’m also 15 and my mother says that I shouldn’t worry about it but it’s been over 100 days and now I’m starting to get concerned, but the thing is that everything is normal! No unusual smell, discharge is normal (though it does switch from clear to whiteish frequently but I assume that’s normal?). I don’t know if there is something wrong with me?