There are many lessons we can learn in our own lives. But it’s also important to learn from the lives of others. No need to burn your hand on the stove to learn not to touch it..
I guess “life lessons” are called that for a reason. You need to experience life in order to learn the lessons.
And the more life you experience, the more lessons you’ll learn. Some of these lessons will be tough, but the harder they are, the more beautiful they’ll make life eventually be.