Can this Italian sentence also be used in the imperative ("Believe in yourself!)?

Does "stesso" change for the gender of the self, or is it a set phrase? I mean, as a female, would I use a gender-specific "Credo in me stessa" or would I use "Credo in me stesso" because it is a set phrase?

Why does 'stesso' mean 'self' here ??

Actually my question is similar to @ale901809. Could you say the same with, "Ti credi."? It's my understanding that if the pronoun matches the verb conjugation, it makes the pronoun reflexive. Mi credo = I believe in myself. Ah, wait. I see. It would be, I believe myself.
So, "Ti credi" would mean You believe yourself. Need the proposition. Got it. Nevermind. LOL

Stesso hear means "self"?

That's exactly what it means, isn't it?

Being a native english speaker i like to think or the phase "te stesso" as being te = you and then stesso = same so its kind of like same you which roughly translated to yourself

Does "credi in te" give the same meaning?

Ins't credi an imperative?

I wonder why 'you trust in yourself' isn't acceptable.