The thing is...
You'll never know what is going to happen tomorrow.
I feel like I've been doing good but who knows...
Things can change so fast... until... sometimes...
I'm not even sure I'm doing the right thing.

People say...
This is the best way, this is what you should do,
Think about your future.

I'd say... how can you be sure?
Because you can't guarantee that tomorrow will come.