It takes time to grow up and become responsible. You have to work hard with yourself. Some people never manage to get there.
The firsts, and most important, step, is to get into with your uncomfortable feelings. Only by knowing them, can you learn to handle them responsibly, and get rid of tendencies to act without responsibility.
Learn to recognize the parts of you who wants to act responsibly and irresponsibly.
By working on solving your problems in life, you can get happier and more satisfied.
Once you understand your feelings, this article teaches how to use your knowledge to find better solutions.
Being responsible involves changing yourself. This article teaches how to do this.
To act responsibly, you have to learn to think in responsible ways, and reject irresponsible ideas.
You cannot become a new human overnight. Take one step at a time. Make a plan for how to change yourself.