I get this too. I used to be one of those people but here's what I did to change that and you will too.
Again, this is a poverty mindset. You have probably felt like you heard God about something, started to try and obey God and then quit or fail. God's grace is ABUNDANT. His mercy is new every morning. Galatians 2: 21 says, I do not nullify the gracious gift of God, for if his righteousness comes through observing the law (and performing) then Christ died needlessly. There will be a learning curve in growing a profitable business but a strategic plan, accountability and a gracious God will help you finish what you start and then set your eyes on bigger goals for the next year!