Earnest deposit

I recently made an offer on a home in Michigan...I offered the list price because the realtor said there was another offer. I am a first-time home buyer so I placed my trust in the agent to have my best interest at hand. I was told I needed to give him a check for $5,000 and that it would go toward my down payment. I was never told that I could lose that money if the deal did not go through. One week after I made the offer an inspection was done and several days later when I took a look at the inspection report there was a list of repairs needed. I was told it was too late to do anything and that I was responsible for the repairs. My realtor started to treat me like dirt. Before I made the offer I was experiencing some health problems. Those problems got worse and I decided I should not take on a large mortgage at this time. It was then that I was told my deposit would not be returned. I asked why I had to put so much money down and he said because he wanted to make sure the seller took my offer. I was never consulted. There is no where in the purchase agreement requiring that amount of money as a deposit. My realtor will not answer any of my questions. Did I not have the right to put down what I felt comfortable with? Did he not have an obligation to explain to me that I could lose that money?