You will learn lessons. You are enrolled in a full-time informal school call 'life'. Each day in this school, you will have the opportunity to learn lessons. You may like the lessons or think them irrelevant and stupid. There are no mistakes, only lessons.
Growth is a process of trial and error, experimentation.
The 'failed' experiments are as much a part of the process as the experiment that ultimately 'works'. A lesson is repeated until it is learned. A lesson will be presented to you in various forms until you have learnt it, then you go on to the next lesson. Learning lessons does not end. There in no part of life that does not contain its lessons.