Hi Kaikou,
Your question is about personal accountability and what works. For most people, I agree with the suggestions for finding a buddy to help drive personal accountability. This is basic human psychology, and it works for most (about 90%) of people. This is the central concept of Alcoholics Anonymous and Weight Watchers. It works particularly well for people who seek external validation. Free Accountability Meetup groups are out there, lots of churches and social clubs (Elks, Lions) run them, in addition to specific groups like AA and WW that work off this mechanism.
So what do you do if you're in the 10% of people who don't get value from external motivation? Write it down.
I tend to be internally motivated, which to most folks, will make it seem like I have my crap together all the time. I have "grit." Everything looks easy for me. I'm confident in meetings, I have grace under pressure, I make all the right choices. But I still struggle all the time with following through on goals, staying focused, getting discouraged with slow progress, and I'm my own worst critic with an internal voice that would make you cringe. I still need personal accountability, but it doesn't do much for me to have someone else hold me accountable.
I found that writing down my goal, and progress toward achieving it, got me through this. It was the only way I've ever been able to successfully lose weight. I write down business goals, I have a personal investment plan, I have a five year plan. I found that if I wrote down my goal, and my progress against that goal (quarterly for investing, monthly for finances and budget, daily for dieting) it helped me keep my promise to myself.
Why does this work? It seems there is a connection between the part of your brain that reads and writes, and personal accountability. I can actually feel this when I'm dieting and keeping a journal of what I eat: I think about eating something naughty, and I have an intense visceral reaction to having to write it down later. It's the writing that keeps me from falling off the wagon. Some documentation on this here:
Sid Savara writes a lot about accountability and productivity, you might like his other stuff.
http://sidsavara.com/personal-productivity/fact-or-fiction-the-truth-about-the-harvard-written-goal-studyAuthor cites a meta-study on goal setting which found successful goals are Measureable, Actionable (you can articulate the steps to get there) , and Achievable (you set goals that you believe you can meet). Writing it all down helps with these three steps.
http://www.huffingtonpost.com/vanessa-van-edwards/the-science-of-goal-setting_b_6335764.html