if you can accept that DNA is writing the programme for our emotions and emotions are the thing that motivates us and during our lives we then develop different triggers for our happiness and unhappiness and we have different abilities at managing our emotions so we seem different and individual then DNA through emotions is a major controller of our lives
but DNA has really only one apparent purpose which is to survive (but really it is survival which is choosing particular DNA) we are just a donkey- like servant of DNA
we all die and so we are (somewhat) servants of our bodies because eventually they will end our lives (unless you believe in afterlife)
so if you don't believe in afterlife then what are we doing here? just being servants of dna and our bodies? well... we don't have much choice do we?... we can't get rid of emotions have you tried? if you did you would be a robot a robot which had no motivation you couldn'twant to think, say or do anything because without emotion you can't want at all
so .... better enjoy emotion aim for happiness avoid unhappiness the alternative is madness figuratively and literally
this is utterly simple advice which seems to make deep philosophical rumination look silly but who said life has to be a mysterious thing anyway any particular authority?