First time buyer put off compleatly by Seef

As a first time buyer of property, i was very excited to find the place i had been looking for for some time in the exact area where i was looking. After chatting with the estate agent, everything seemed good and i started to complete the offer to purchase. After taking it home and reading through the contract, i crossed out the clauses which did not apply to me or i did not agree with, now i'm not an unreasonable guy but surly a contact needs to protect both parties involved and not just the seller? when i presented the contract to the estate agent, i was presented with very rude answers and responses. I received little to no correspondence. when i did receive some feed back, it was 20 min before the signing of the contract where she sms's me to say she had changed the contract for me and uncrossed the clauses with out presenting them to me? she also gave me 20 minutes to increase my offer. i responded to her and 4 hours later i got a half hearted response back from her saying i had lost the property as there were cleaner and higher offers. This is fine but if i was notified of this i would have done something to change the outcome. I feel very neglected and dishearted Seeff.