[Inaii]

I'm not sure if this is the right place to ask this question (or if it's been asked before, sorry if it has) but can anyone explain why I'm being warned off of getting a 125cc as a starter bike? I understand they may not be very fun, but I was under the impression that starting on a low cc bike was the best way to begin to ride?

I haven't gone near a bike (pedal) since I was 10 years old because of a really bad accident and I'm absolutely terrified of riding on the back of one (motorcycle) because I won't be in control. I thought a 125 would be a good way to overcome my fear of 2 wheels since I want to ride. Am I making the wrong decision by judging that a 125 would be the best place to start for me? If anyone has any insight or experience, I'd greatly appreciate it.