I say this often to clients. Some are surprised; they don’t believe me. Some people are under the false impression that feelings “just happen” and we have no control over them. Actually the way you feel is determined by what you think. And it is very possible to change the way you think. It can be a long process, but I assure you I’ve helped people succeed by using Cognitive Therapy.
Here is a short article with some simple examples of reframing your feelings. I hope you find it helpful.