Mabe you need to see a different doctor and evaluate your medicine. Sometimes all of the medicine that people are put on makes everything worse. But please do not give up. If anything at all, go to the hospital and check yourself in. Things always get better. I have been there when you feel like nothing will help, but IT WILL GET BETTER. You may have to be the one to get the help you need.....
If you're not having much success with your current therapist, maybe you should consider finding someone else. Usually when someone is suicidal, medications are the first step to stabilize those thoughts and urges, then therapy comes into play next. If you are truly feeling as though you could commit suicide, I would go to the ER and explain what is going on, see your doctor, or find a new therapist. There are so many things a person can do with their life. If you're feeling as though you are not where you want to be, maybe this is the time to start searching. Are you in need of a job, or do you hate a job you are at currently? Are you involved in anything you truly enjoy? Do you have any support people to be near?
You are in it right now and that makes everything very tough. I bet it is hard to see beyond that given how you feel, but there is hope and things get better. You need to just trust that even though you may not feel like that right now.
Have you seen Vanilla Sky? The movie with tom cruise? Best line from the movie: "every moment is a new moment to turn it all around". Of course that compresses time quite a bit, but hey, baby step, and many steps. Besides your feelings about your age, what's stopping you from getting a job? do you need the money? Can you volunteer? You can make this world a better place. Trust that, even though you may not in this moment feel that.