Strong desire to serve/ordain

every meditator at a point in his her life goes through a dilemma of whether to ordain or to live a lay life. Although it's a wholesome disposition, I wonder if its a lack of strength to face problems as a veil that shadows the decision. (It's proven so for me) But sometimes the emotion to give up lay life is so strong(and then again it's just a emotion-state of mind which is also annicca) that the more I look back, the more I get the feeling I should have done it a long time ago because the fruits even as a lay person are so evident and clear (wonder what pool of calm monastic life will bring around) The question remains, how can one determine ones decision to ordain, whether it's a strong volition or not (because if it's not I would hate to go back to lay life as a failure and discouraged on the path of Dhamma)