Well you have made the decision to make a change and that is the beginning of the journey. The easiest place to begin is with what you are eating. How many veggies and fruits are you getting? How much meat and dairy do you take in? What snacks are around the house? From there you move into fitness.
The main thing is just being upset about it does nothing and in most cases creates a spiral of guilt and unhappiness.
Nutrition + Fitness = Health