How do you choose lane ??

I am in peculiar position right now. As of lately I have started playing Top lane. Not because I am fun of it but because I like Garen. I was always more in fond of mid bu Garen would be kind of weak there and at the same time I can't go to mid because I am not that good with mechanical champions. So I don't know if I should pursue mid or Top and what should I do to find my lane. Bot and jg are out of the question.