The psychology of trading is very interesting. You really have to know yourself and be able to approach things with a level of objectivity not possessed by many people of any age, let alone young people. At your age if you come from a very intense team sports background where the coaches drilled you about trying to remain nearly the same, emotionally, irrespective of whether you won or lost, that would be a good start.
There are various books on trading psychology. I'd suggest reading a few. I'm not sure what is current so won't make recommendations.
There are various books on trading psychology. I'd suggest reading a few. I'm not sure what is current so won't make recommendations.