Question, is this about not wanting to grow older, or something more? I think we all have fears and concerns about getting older, and they start right around 18. This is the age where you are forced to decide about your future - college, work, career, moving away from parents, etc. I think all of these concerns are common, and ctb is a way to avoid all that.
But potentially, you miss a whole lot more if you go that route. No, your 20s are not going to be perfect, but they can also be a lot of fun.
So if this is simply an an age thing, my advice would be to enjoy the ride. I can always exit at a later point in life. However, if the issue is more than age, weigh your options carefully and don't base it solely on a number. And don't make any decisions impulsively. The results could be significantly worse.
Wishing you all the best in which ever path you choose.