I am my own worst enemy

I have no idea what is wrong with me.
I completely sabotaged myself every single day this week.
Stress?  I don't even know...I was doing so well today and then BAM...and I justified it in my head as "well it's the weekend I'll just start over officially on MONDAY"

UGH!  So mad at myself right now.  How in the world did I will power through this in January?  HOW?!  Because I need that strength again!!