The former Wigan Athletic striker moved to Villa Park this week.
"Iâ€™m sure thereâ€™s a lot of people who have seen the move and thought: â€˜He wonâ€™t do that and what are they doing that for?â€™" he said.
"Half of Villa fans have probably said that and half are probably excited by it. Thatâ€™s just football. Everyone has an opinion.
"Itâ€™s up to me to prove them wrong. Iâ€™ve done that before.
"Iâ€™ve got a point to prove. I think everyone thinks Iâ€™ve gone into the Championship and Iâ€™ve just failed and everyone was probably expecting me to move down to another club in the Championship.
"But Paul has given me a fantastic chance to show I can still do it. And I believe Iâ€™m in the best shape Iâ€™ve ever been in, body-wise and physical-wise.
"I just havenâ€™t been playing. That was the disappointing thing. I had a knee problem that niggled me for a few months but the new manager, Uwe Rosler, has come in and heâ€™s got his own beliefs.
"So if you are not playing in the Championship and youâ€™ve got Aston Villa, of all clubs, coming in for you in the Premier League to play for a manager youâ€™ve played under before, itâ€™s a no-brainer."
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