What do i say at the court? Plead or plead not guilty?

hello goodafternoon, I would like to ask for a help for my case of theft at my job . I know it sounds like I am a bad person for doing it but I made a huge mistake in my life for doing this I just went through a really tough year last year. I wasn't sure what I was doing anymore. I never got in trouble by the law before its my first. I go to college I have a goal in my life to finish my degree but not in this way by making a huge mistake I can't forgive myself all I can think is to be positive its 2017 time to heal and move on and accept that I have to take actions on this. I have a family who cares about me and I don't want to disappoint them with the trouble I did. It was just financially I needed the money that I took I was so close minded and stupid for the wrong move I did. I have a future I want to commit but with this kind of problem I can't think but feeling like I'm in trouble by this for life. Please please help me court date is next week January 11, 2017