I'm such a chicken. I'm in my 50's and I don't ride roller coasters. My wife and I were in MK in 2015 and in line for the Dwarfs Mine Train. I was getting nervous freaking out because it's a roller coaster.
Then I noticed the 5 year old in front of us in line. Not scared. Excited.
Figured, "fake it 'til you make it". Got on, rode it, enjoyed it.
Did it again in 2021. I still don't like roller coasters, except the ones I like.
I'm similar. I'll ride anything at Disney (except tower of terror and rockin'). I often have to remind myself of the little kids in line around me (though little kids also ride tower of terror and I definitely will not do that so there are limits to that reasoning!).