Is Writing my purpose?

[Templesign]

Hello guys, I am from Germany and new here.
I have the problem, that I missing direction in my life. I have the deep desire to master some skill, cuz the most pleasurable feeling i got so far is the feeling of flow, to do something just for it's own sake (ofc the intention is "to get better" or striving for the good feeling of effortlessnes so to speak.) But I don't know what to master... I always think of writing, but I am not sure whether it is my passion. Everytime I think of it I get this feeling of huge resistance. As I write, I often got hung up on something and it feels like work. No pleasure at all. But sometimes, sometimes there it is: the flow -- I got soaked up and write and write and write, without thinking, just doing, I am not aware of myself and after I read the written, it is not that bad. But then again, the next sentence feels like work again and after a whole session the thought of doing it again wants to make me vomit all over the place. It seems like a lack of joy for me, still it is the only thing that is constantly coming up in my mind. So should one look out for the thing that he or she is interested in  rather whether he or she has fun doing it? Interest > fun?

I just don't get, whether this is my purpose calling or not. When it is, why so much resistance?

Sorry for my bad english and thanks in advance guys!