What will prevent me from getting to goal?

I'm 40 pounds from my goal weight, and needless to say the weight is coming off slower. I'm OK with that because it is coming off. My question is this, as long as I'm keeping my calories to a minimum, eating my protein and exersizing, shouldn't I get to goal? I think my goal is realistic, I'm 5'6 1/2, 46 years old, and would be happy at 150 (would be extatic at 140, but don't want to set myself up for failure or dissapointment). So, what do you think? I guess I'm starting to get paranoid because the weight is coming off slower and honestly to be 150 just seems like a dream to awesome to even imagine, in other words to good to be true.

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