I can get through anything that life may unfold for me.

You have already survived something you were sure would finish you. Probably badly. Probably without noticing the moment it turned into past tense.

Nobody feels capable in advance. Capability is not a sensation available beforehand — it is a description applied afterwards, by people looking at what you actually did. Which means today's lack of confidence about some future thing says nothing whatsoever about how that thing will go.

You have a record. It is longer than you think, and it is the only real evidence anyone has about what you can take.