She said I was immature and naive. How can I make myself mature?

Maturity represents a person's experience and understanding. You may not have a lot of experience, and there are many people and things you haven't seen and experienced, and you can't make the best decision on many things. Therefore, maturity cannot be changed overnight.

Maturity means that with the growth of age, the mind will naturally mature, which cannot be forced in a short time.

And when you experience setbacks and failures, your mind will mature, and then you will consider many other external factors for one thing. That's a sign of maturity.

So, don't rush to grow up, take your time, and one day you will become a mature person.