There is a statistic for everything and 99% percent of the time these stats are right. If you search any industry or field and google the probability of success then you going to be greatly disheartened. Whether you want to be a successful actor, sports star, entertainer, writer or entrepreneur - you're going to go through the ringer and the stats are mounted against you. The beginning is an uphill climb because you cannot imagine even how much further you have to go and whether you'll ever see the summit.
There is a quote by Charles Bukowski that aptly describes this topic, "Writing about writer's block is better than not writing at all." This quote is a true pearl of wisdom, nothing like experience. Whatever field of writing you may be in, author, journalist, blogger, editor, etc; at some stage you are going to feel like you cannot string a sentence together. When that feeling creeps in, your gut is going to tell you to leave it alone. Take break, go grab some coffee and try again another day. Although, that may work for some, it can smother you deep in the clutches of a bad habit.