Cedar point roller coaster fear?

Ok im 13 and I have a somewhat fear of roller coasters. I ethier have to cedar point with my mom and sister or go with my younger sister and her dad to Tennessee for a family reunion. My mom and sister have gone before and said it was fun, but I just don't know. I mean I'm one of those people who rides it and is like YEA let's do it again, but it's a pain to get on one without almost crapping myself. Anything help you get on a roller coaster ? How did you get over it ? Please help.