You can eat whatever you like apart from what is declared Haraam. However in essence if you say that I will not Chicken because you think its not right for your health or its cruelty against animals which most of the vegetarians think then this is against the teachings of Islam. Allah has created these things for us to eat and surely they bring positive changes in our lives.
I dont have a problem with much of what you say, but I have objection to this "Allah has created these things for us to eat". I am sure though that other religions also endorse such a moronic view about the rest of living beings. I dont think though that this is actually a good view to have.