First, the post is about
Disneyland and this (even though it doesn't really look like it) is the WDW section. So your post will likely be moved.
The coasters don't go THAT fast.
I've found that I can get rid of or control the stomach feeling by exhaling forcefully* and controlled while on downhills. It really helps. Makes for awkward looking pictures but oh well!
Logger's Revenge at Boardwalk in Santa Cruz? That's just a log ride? So go on Splash, that's for sure. If you can handle that downhill you can then handle California Screamin'...just saying.
I am more afraid of what's gonna happen on both Big Thunder Mountain and Space Mountain
What do you think is going to happen? If you name it, can you then work on it?
But...ultimately, they are just rides. If riding them isn't going to create enjoyment for your day, why bother at this point? You're young and have plenty of time. Years down the road it'll be your kids urging you to get on the rides.
I hate freefall rides, too, but I like TOT. TOT pulls you down. The action is the pulling; if the action of it stops, you stop. You're not out of control while going down the elevator shaft; quite the opposite. I can feel the difference and, with my controlled exhale, I like it.
*that's why screaming from fear can help with those rides...it's just a big exhale with your vocal cords involved!