Your emotional state is something you can influence. It is highly changeable, and you can make a difference to it relatively quickly.
One technique to have a go with is 'acting as if'. For example, if you want to feel confident, take on the posture of confidence, hold you body in a confident way. Look at people with confidence, act as if you ARE confident. Move with confidence, breathe with confidence.
When you do this, your body responds and your mind will shift. Physiology and mood are inter-dependent. So, why not look out for people exhibiting the emotional states you want. Really notice HOW they do it. Then, give it a go.
What emotional state do you want to benefit from today?