someone made an account with my email

hey so i have absolutely no idea how but someone used my email (had it my entire life) to make an account on tiktok. i just downloaded tiktok and wanted to make an account and it said i already had one, so i was confused and logged into it with an email code. that account was def not mine and i didn’t know anyone following/being followed by me. i tried deleting the account to make my own with my email and it just tries to get me to reactivate the old one. anyone know how i can make my own account with my email? i don’t want this randos account