Social workers, counselors and psychiatrists and psychologists all do psychotherapy. There are many ways to get into the therapy and counseling field. While this field is changing somewhat, for example, there are now many biological explanations for conditions previously thought to be entirely psychological, still there will most likely continue to be a high demand for psychologists. There continues to be a shortage of such professionals qualified to work with the deaf. Many high schools now offer psychology - good place to start.
Most colleges have psychology departments where a entire list of recommended courses are outlined.
Gallaudet University also offers several psychology programs. You may want to decide if you want to attend school with other deaf students or if it is more important to you to get an educational experience with hearing students and use an interpreter. Both ways offer advantages and disadvantages. Many colleges and some high schools offer programs for peer advising or mentoring. Getting to know different kinds of people and being tolerant and open minded will help greatly.