What are good ways for me to find the self-control/discipline to diet correctly?

Varies per person: Effective dieting is extremely difficult and has generated both many helpful programs and innumerable scams. Many books have been written on this, so 400 words is not going to give you the answer you seek. Self-help groups such as overeaters anonymous are useful for some. Working closely with a dietician may help. Recruiting family may be useful. In short, if you can't do it alone, seek help.