How do you stop this bad habbit....?

well i'm 14 and i know it's pretty unusual for a 14 year old so suck on her bottom lip, but i've been doing it since i was like... around 5 years old. My parents say i started to do this because, once they took away, the pacifier (i was IN LOVE with pacifires as a toddler, i even had a collection of them, i always had to have one in my mouth) i've developed this really bad habbit i try not to do it but it's hard. so what can i do to stop it??!