I’m the same, and while I can’t tell you much (as I’m in the same boat) I think the main things to look into are worrying about a perfect outcome (never going to happen), over-thinking and self-doubt. I’m reading a decent book called The Worry Cure.

You know there’s nothing anyone can tell you that you don’t already know.

If you want to do something like acting, you have to put the work in and hope that your passion carries you forward.
As for the feeling that you enjoy it one day and are interested in something else the next, I’m not quite sure why this is, but I have it too. I think it comes down to a variety in choice and not being sure and – again – wanting everything to be perfect.

You’re gonna struggle with any of the options you end up choosing. Because life is never simple.
So, just pick one and go with it.

Or, keep running around wondering what you should do.
Easy trap to fall in.