I’m on the fence on this. I’ve heard that after the age of 60, it is very difficult to learn anything; on the other hand, I don’t think that is impossible for someone with courage and determination to learn new things. To be on the fence about something means that you can't decide about something. (I'm on the fence about marrying my boyfriend). In this instance, when taking about your opinion, I would not use this idiom. You can say, "I'm of two minds" ➡️What about the structure of my sentence? ➡️Is it right? ➡️The comma before (because) is right? 👍🏻thanks beforehand.