Psychotherapy can help you with such difficulties as: relationship problems, life transitions, depression, anxiety, poor self-esteem, feelings of powerlessness, and anger. Many who undergo psychological therapy report improvements in the quality of their relationships, increased confidence and a growing ability to take risks and make changes in their lives.
There are probably more similarities between psychotherapy and counselling than there are differences. One could say that counselling tends to focus on specific and current life issues and is more often short-term, and that psychotherapy is more inclined toward an open-ended exploration of deep-rooted or recurring problems. However, such distinctions barely begin to scratch the surface of the debate. For more on this question, see my blog post The difference between psychotherapy and counselling.