How can you stop having a childish inner voice?

I feel as though on some level I haven't come to terms with how old I am (26) I often feel like a teenager even a younger teenager. My inner voice sounds 10 yrs younger than I am. I think it reflects on the things I say and even comes out in my voice at times. If I don't prepare myself to speak like an... show more I feel as though on some level I haven't come to terms with how old I am (26) I often feel like a teenager even a younger teenager. My inner voice sounds 10 yrs younger than I am. I think it reflects on the things I say and even comes out in my voice at times. If I don't prepare myself to speak like an adult. When I look at others my age I don't get the same vibe from them. They're mature, how do I become psychologically mature?
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