Boys and College.

Is there such a thing as a perfect fit? or does everything require work? I find myself in two situations where I just keep asking myself when it's worth it to keep trying, or when the chemistry isn't there. Most people would agree that to cultivate a good relationship (with a boy or with a school), effort is required. Right now though, I am struggling to decide how much effort is too much effort. Is one semester at a school too short a time to decide that it is not the right school for me? Is "x" amount of time talking to a boy far too much? I am just struggling to understand at what point I should expect harmony, and seek change if that harmony isn't reached.