First the bad news: Entering therapy will not change your mother, spouse or boss. It can change the choices you make about how to react, respond, interact and interpret the people and events in your life. This process can in turn significantly change your world for the better.
Yes, we all come in hardwired in many respects and we all have to work with what we have been given. Within those parameters, however, what we can transform about ourselves, our relationships and our behaviors can be amazing. And while traumas can leave a scar, the possibility for dramatically reducing the size and impact of those scars is available.
Bad therapist joke: How many therapists does it take to change a light bulb? Only one but the light bulb has to really, really want to change.