Change is never comfortable - NEVER! So, thinking that changing your any aspect of your lifestyle (diet, activity level, routine, activities etc) is going to be one pleasant ride, is not realistic. However, once a change has been implemented it can become COMFORTABLE! It takes time though.
Because of the lack of comfort involved in changing your habits, it's easy to say, "I can't" when it comes to making that change. It's easier to say I can't give up or change _ _(you fill in the blank)_ _ than to actually go through the process of change in order to give up or change that thing.
That being said: proves that, "I can't" isn't the real problem. Instead, "I don't want to" is the real reason behind a lack of change.
This week I challenge you to evaluate anything you've said, "I can't" to. Ask yourself, is "I can't" really the truth or is it really, "I don't want to"?