Self confidence is not something what we can just pick up when we need it unfortunately, it takes lots of work, lots of failing and lots of progress. If you are one, who feels unhappy being in your skin, then is time for a change. Changes are hard. Very hard, but in the end it will worth it. Start small, put goals in front of yourself and when you reach it, celebrate yourself with putting a bigger one in your way.
It can be anything, what you wanted. Cutting your hair, going to gym, or have tattoos from head to toes. The key for is not giving up! Keep going, even if it hurts, or mentally destroys us. Have to learn to be brave and see the bigger picture. Never be shy to ask for help, we are all learning till the last day of our life, asking for help is a wise decision not a weak one.