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My problem is that I don't know what stuff is going to give me that same felling of confidence. I need advise?
A hobby that implies self improvement. Like the gym.
A successful career that's in constant growth.
Starting and guiding your own business to the point of success.
Good social circle, trustworthy friends with whom you can go out regularly, visit the world and create experiences.
True confidence is not a feeling. It doesn't come and go overnight. It's a state, and it's derived from the inside. Constantly setting and achieving relevant goals nurtures your sense of self-worth, and allows you to understand that nothing is irreplaceable.
It comes down to having options, which implies self improvement to the point you can consistently generate options. Regardless whether it's your job, your girlfriend or your friends.