At 28? Woah. How dare you.
Just the other day, I met a woman who'd gone back to school at 40. She'd literally come back from the opening of the school year. I'm thinking of going back to school and am continually studying at 26. There's people who change their mind at 60. Who cycle through a bunch of jobs, and change who they are and what they do entirely every few years.
There's absolutely no shame in deciding, after inner work, soul-searching, and just getting to understand the complexity of how you function, in deciding maybe another path is better for you. On the contrary. It's something to be proud of, I'd say.