Back for round 2

Made it through my first quarter of student teaching. Thank God. However I am now in my 2nd and final quarter and am having daily panic attacks. I am ready to drop out of the program the anxiety is debilitating. I'm wondering what the fuck was I thinking when I decided to go through the program? I have spent the past 3 years working on this credential and at this point I wish I had just started working after I got my B.A. I feel like I've wasted so much time, money and energy. I'm 26, is that too young for a midlife crisis?