I feel like I'm not where I want to be?

So, I recently just found out that with the major I've chosen, which is theatre, it is going to take me an extra two years to get my associate's from the local community college I am at. It will take this long simply because there are two courses I am required to have two full semesters of. Granted, I am already a year older than everyone in my grade, so by the time I get my associate's degree in 2020, I will be two years older than everyone, and all the people my age will be halfway through getting their Bachelor's. What if I go through all this and it isn't even worth it. I've explored different degrees, and theatre is really the only thing I've ever enjoyed. On the same token, I don't really want to be stuck at my parents house for the next two years. I'm sure I'll get a job at some point once I don't have as many classes to worry about, but I'm just worried this will all be for nothing, and that I'll end up having to start over because theatre ends up not being reasonable for me, and then I have to start over, not even getting anywhere until I'm like 30, and then I'll just be unhappy. Maybe I'm being dumb or unreasonable, but I'm just so stressed. I know that success isn't measured by how quickly something gets done, but it sure as hell feels like it. Everyone always applauds those who are the youngest to do something, and I just feel like I'm already late to the game.

Sorry if this was just a ton of rambling, and made no sense. Basically, my question is: How will I know I made the right choice? What if I fail and end up worth nothing, with no skills and no career?