The decision about the future profession we take quite early, and not all hit the target the first time. If you feel that in a career plan turned wrong, not everything is lost. History knows examples when people at different ages radically changed their lives, started from scratch in the new profession and achieved success.
But keep in mind that for this you need money. The amount should be saved taking into account the fact that for a while you will study and receive the salary of a beginner specialist. At this time, savings should ensure a normal standard of living for you and your family.