Is anyone else in my class doing this?
Almost nobody. That is the point.
Kapitel: Who mental training helps
Is this only for people with problems?
No. It is what every world class athlete does anyway. You are just starting earlier.
How do I convince my parents?
With four sentences. In my class everyone sails the same boat. The only place I can still get faster is my head. Almost nobody trains that. And it stays with me for life. If you argue like that, you are the best proof that it is worth it.