Am I being screwed over by listing agent?

[Nat C.]

I viewed a property for 87K which is a homepath property and has been on the market for over 2 months. I called the listing agent to say I wanted to make an offer of 80K. He said if I could close by end of July he thought it would be accepted as banks were always eager to close properties by the end of the month. I went into their office to sign paperwork 2 days later and spoke to a different agent. She said they now had an offer at 81K so I had to come in higher. I subsequently offered 82K. I made a mistake by calling two days later to see if there was a response from the bank. The person I spoke to said there was no response. 5 minutes later I got a call from the agent I'd met with who said the other buyer offered 87k, so I needed to offer 88k if I wanted it. I said I needed to think overnight and she said no, I needed to confirm immediately. She started saying how I really needed the property so I had to offer 88k and I ended up saying OK. The next day the property went to pending and the day after I received a call from them that I had to go in and sign paperwork with the higher offer price. Who thinks I was screwed over? I know it's illegal to tell a buyer what other offers are on the table and I'm wondering if they used my apparent desperation to drive the price up?