I'm 16, I don't study psychology in college, only biology, chemistry, physics and maths, but I find evolutionary psychology incredibly interesting, because it's the only psychological theory that makes logical sense, in my opinion.
If, by universal consensus, our body's functions are determined by the natural selection of the passing of genes determined by advantageous or disadvantageous applications to a person's environment for reproduction; which includes survival because the person needs to survive long enough to produce offspring and, for the most part, then raise it to promote further reproductive behaviours, then why would the same theory not apply to our psychology?
The brain is an organ like the liver and the heart, brain cells contain nuclei which contain DNA to be passed via mitosis, so therefore our brain is also affected similarly by evolution like our body. We project evolutionary psychology onto other animals, stating that their behaviour is purely motivated by search for mates, self-preservation and resources, but we are hesitant to apply that to ourselves due to ethical or emotional objections, even though we have evolved from LUCA the same way all other life forms have evolved.
The accepted theory of psychology in mainstream science mostly exclusively describes behaviour, and when the theory does explain it, it simply describes a certain gene from twin-studies or explains how the environment promotes the behaviour, without referring back to evolution or the "why", because, in most cases, there would be no ethical method to test evolutionarily psychological hypotheses, and therefore, a lot of theories cannot be proven even though they fundamentally make sense.
I was having existential thoughts the other day, because I realised that everything I do, consciously or subconsciously, is only a vehicle for me sexually reproducing, because I am an animal, like all other animals. And I started to break down the root causes of everything I ever loved doing in life, and realised that the only reason I liked doing them was because they were traits that correlated with reproductive success, and if they didn't I wouldn't like doing them.
For example, I like discussing debates on the Internet, but the only reason I like doing that is because of the idea of social bonding, and that because I am 'in touch' with a group of some sort, I have a chance of reaching potential mates in the group (of course the logistics of this are unrealistic, but my emotions haven't adapted to realise that, they are primed for an environment where everyone I talked to was close by). Or if I wanted to get rich, the only reason for this would be to invest those resources into a relationship for a female partner to increase the chances of successful raising of offspring with increased available resources (big house, better healthcare for the kid etc.).
Or another one would be that I had an interest in maths and physics, but the only reason for that interest was so that I could share that information with a group and increase the chances of survival (and therefore reproductive success) within the group or attract mates for myself, because they may see me as an intelligent father that can adapt to situations to protect potential children. And everything else I enjoyed doing eventually fell into this pit of evolutionary psychology.
I couldn't accept the idea that I had no free will, and that everything I ever did was predetermined by genes and/or the expression of those genes in response to an environment (including cultural influences), because it would eliminate all meaning in my life, because I knew why I did everything, and that there was nothing left to explore internally.
I also hated the idea of becoming a slave to other people in the pursuit of contributing to promote reproduction, so I felt a pressure to abstain from these behaviours as some sort of knee-jerk retaliation, but doing this would exhibit an equally miserable conclusion, since I would have cut off the chance of happiness in doing what I wanted to do, the happiness of 'not knowing why' now ruined because I now know why, it partially relates to the concept of "ignorance is bliss". I also started to apply this to other people that surround me, and I lost emotional connections with them because I started to unintentionally dehumanize them based off of this concept. I'm stuck in a philosophical stagnation of sorts and I would like to discuss this topic.
Should we abstain from what we like to do and our desires because we know why we do them?