What stays from studying?

I just noticed, that it seems that not much of the Latin and Ancient Greek, I once studied, is left. And I was good in Latin and Ancient Greek but already after 1 year of not studying it, almost everything has found its way out of my mind. It seems far easier to forget things than to learn them. And that frustrates me. I am willing to put a lot of effort into studying for school, but when the knowledge I gain from it just does not stay, it is pretty depressing. It seems to be a good argument for less studying and more experiencing. Even though I can forget experiences as well, the change they may do to my personality stays. For example the knowledge about what drugs do to my neurotransmitters is not an insight that seems to be of great significance for my personal development. To take the drugs may reveal in the end an insight that make me learn more about myself. I know that is a bad example, because taking drugs is not an experience that is particularly good for my personality development. (I just had to learn all the impacts of various drugs on the body for a Bio test.) That the human being does learn from physical experiences seems to be supported by the IB-programme, since in order to get our diploma we all have to do a Creation and an Action and a Campus Service and a Community Interaction, in which we more or less exclusively learn from what we experience and learn rather less from exhausting ourselves mentally. When I look at myself, it seems, the things I studied in school were only in very few cases important in themselves for my personality. All the things that are involved in the process of studying in school such as having the feeling of success when you finally managed to understand a very complicated Math concept or to help other students to understand Math or working in a group or going successfully through the stress situation of giving a test or holding a presentation, these are certainly things that are very important for a personality development but they again seem rather to be experiences. Philosophy may be an exception, since the philosophical concepts I studied did something to my worldviews and hence my personality. Maybe the knowledge about drugs and neurotransmitters also does something to my worldview and I am just not able to see that right now, but when I forget it again, it anyway didn’t develop my personality, did it? Experiences can alter my personality even, when I forget them again, since experiences may have an effect on my unconsciousness and hence can effect my feelings and actions, which define my personality.

But probably that’s after all a wrong approach to knowledge in itself. Knowledge shouldn’t be judged or valued dependent on its significance to my personality. So I guess, there is some value to me studying Latin, mathematical concepts and neurotransmitters.