It takes courage to start therapy. Chances are, whatever has been bothering you has been in your mind for a while and you have not been able to solve the problem on your own. So even if it feels scary, therapy provides a safe space to deal with thoughts and emotions, develop coping skills and improve your overall well-being. 
One of the greatest benefits of therapy is that your relationship with your psychologist is confidential and non-judgemental. No matter how much you may be judging yourself, your therapist will not be judging you; rather she will be helping you figure out how to change an unpleasant outcome in a way that is caring and helpful. You will feel heard and feel validated.
For many of us, the hardest thing is learning to manage our emotions. Whether they are sad or angry, confused or anxious, dealing with emotions, in a healthy way, is the key to a healthy life. Your psychologist will help you sort through what feels like a hodgepodge of feelings and learn techniques to manage them effectively.
Improving your relationships is another benefit of seeing a psychologist. Whether personal or professional, healthy relationships are one of the keys to a happy life. But to get them right you need to learn conflict resolution skills, boundary setting, and good communication skills. Once you learn these things, your confidence and self-esteem will improve.
So far, I have been talking about personal growth. But for some people, there is also a need to address mental health conditions such as depression, anxiety disorders, and results of trauma. A psychologist can treat you using evidence-based techniques such as Cognitive-Behavioral Therapy to help you get better without using medication.
Seeing a psychologist is not a sign of weakness. It takes courage to care for yourself and find the support you need to get better.