One of the reasons we tend not to feel as good as we could as often as we could is that we have a lot of training in how to feel bad. Not only are we shown how to do this, we are often encouraged to do so. In fact, some people actually insist that we should feel bad. Stop letting people should on you.
If you are new to tapping, it will be beneficial to also watch the first episode in the "Tap Out Your Fears" series -- which explains the basics of EFT -- click here.