@awoelt,
In my opinion, the reason for life is happiness and fulfilment, and happiness is an autotelism (a reason in itself, that needs no other reasons).
Everything 'why' question you could ask about life either leads to an infinite regress without your autotelism. For example, 'Why do you go to school?
'Because I want to get into university.'
'Why?'
'So i can get a good job.'
'And why do you want a good job?'
'So I'll be happy and fulfilled.'
'And why do you want to be happy and fulfilled?'
'Well I just do.' - this is the autotelism, the reason which needs no reasons.
My advice: Find your autotelism... the thing you do, for which you need no reason, other than the fact that it makes you happy.