What am I doing wrong?

So ive jumped thru countless hoops over the past 6 months to be able to sell on amazon handmade using FBA. Well so far ive made no money after tons of sales. In fact this month they say I own them $50. I understand some of the advertising charges are eating away my profit but when I turn them off I get no sales. Im really screwed either way. On average I make 30-50$ a day. I cant help but feel this is all so intentional and not meant for anyone to actually get ahead. I have tweaked the advertising settings and was really excited to see the outcome this month but wow I really just feel like giving up. Any input as to what I can do to success would be great.