Time does not ask whether you were ready to become older.

Ageing is not a project you are consulted about. It proceeds regardless of whether you feel ready, whether you have achieved what you planned, or whether you have finished being the version of yourself you were enjoying. There is a real grief in that and it is rarely acknowledged. It is also the reason that waiting until you feel ready does not work as a strategy.

Stop treating readiness as a requirement for starting things. Ask what you would do now if you accepted that the timing will never feel right. Then do a small version of it, on the current schedule rather than an imagined one.