My broker will not supply me with a w2, nor 1099. He said since I was paid my commission out of escrow he doesn't have to supply me a w2. I asked the escrow company if they would provide me a w2 and they said they will not either. I made about over $30,000 last year and have no proof to report income to IRS. Do I guestimate the amount on a Schedule C? Is this the only way to show income and what is to prevent self employed realtors from only claiming a portion of income if there is no paper trail?

Technically the broker on the selling side pays the commission to the buyer's real estate agent, and consequently if the amount is greater than $600 the selling broker is required to provide a 1099-MISC to the buyer's agent. The fact that the cash was in escrow doesn't matter. This site explains it better than I can:
IRS Rule about 1099's