You get there, only to find out that there's no there there.

Don't worry, there are more things to do than there are years in your life. Try something else. Go visit some tall mountains, learn to drive/pilot something new, make an art, volunteer somewhere new, or just live differently than you have in the past.

It might not be fulfilling, but at least it'll be less boring. There's nothing worse than getting stuck in a rut, and telling yourself that you're only trying something for a few months is a good way to find interests that you never knew you had.