Realtor buyer tenant agency contact

[Jimmy S.]

 I have been using this realtor for a few years on and off and I put a offer in on a house and on the buyer tenant agency contact they slipped in the contract that any "for sale by owner homes and any new construction homes she must appear with me on showing to represent me which I did not find out until after we signed all the paperwork, if not buyer, which would be me, must pay all the brokers fees.

Is this common practice to include things like this? I do not like this one bit not to mention I need to stick with her for 1 year now and she only does it part time.