"feel forced" is something that comes about through the ordinary course of events but without any actual compulsion. Your first example is pretty good but I'm not sure what the second one means (specifically what is "Macain's act"). "be forced" is something that is imposed by a person or event through some form of compulsion.
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AnonymousWhat is the difference between "be forced to do" and "feel forced to do"?The difference is between be and feel. You might feel that a spider is crawling up your arm, but that doesn't mean there is really a spider crawling up your arm. With the verb feel, think "as if".