How can a 28 year old man mature fast? Why am I acting like a child so often? How should a man of my age act and what should I do to mature?

I am 28 years old, but I am not spiritually mature at all. In fact, I bet a 12 or 13 year old teenager is smarter than me. I can't make my own decisions. My self-confidence is very low and I am very cowardly and shy. I need to pull myself together and do the actions required by my age. So where should I start? I'm also a porn junkie and I've never had a girlfriend. That's why I only see girls in my dreams and that's sad. Thanks for reading.

How can a 28 year old man mature fast? Why am I acting like a child so often? How should a man of my age act and what should I do to mature?
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