I used to do the same; basically just eating whenever I'm bored. I started counting calories by inputting everything I eat into an app on my phone. I've found that just knowing how many calories are in the things I eat and the act of logging those in my phone makes me stop and think about what I'm about to eat. I've been holding myself to 1800 calories per day (along with exercise), and I've lost about 20 lbs in the last 2 months 😃