To What Purpose?

When one is born, there is a purpose for them to fulfill in the life given them.  So, when that purpose is blocked, and they are prohibited from fulfilling that purpose, what are they to do?  Stand still?  Or choose another purpose to pursue on their own?  If they choose another purpose which is different from that for which they were made, will that purpose be blessed and assisted or cursed and hampered?  If the former, than that proves that there is a higher power than man that can overcome the wishes of man.  If the latter, then that proves that whatever higher power there is, it is either limited in it's power over man or cruel at heart and enjoys creating beings to watch them suffer.  So, which is it???