If a Buddhist believes lay life is not ideal for the practice, why does he or she continue?

Usually in the evening, when I am about to retire, I commit myself to finding and entering into a residential Sangha permanently. When morning rolls in, I fall back into my usual patterns like work, hobbies, social, etc. Usually when I suffer, this emboldens me to seek the monastic life but usually doesn't last very long. When I think about it, I feel like the monastic life is the only way to proceed yet I don't follow through with it. Speaking from a general point-of-view, if a Buddhist knows that the lay life is not ideal, what barriers (overt and inconspicuous) are preventing them from seeking and living the monastical life. How can they be overcomed ?