Whats wrong with me? :(?

ok basically, ive had a really tough 2 years (i dont really want to go into it) but the stress caused me to cut myself and tie the string of my dressing gown around my neck in order to suffocate myself. I stopped cutting, and trying to suffocate myself, but i still think of suicide. Im just really really low right now, i feel like my life has no real purpose and im just living each day with no real meaning, and it scares me. im quite paranoid, and ive just lost interest in everything. Its horrible waking up thinking lifes just gonna be the same. I also have the horrible feeling in my chest, like this mive black weight, its horrible. I go see a therapist but its not helping, but does this sound like depression? I used to be really out going, but because of all this emotional stress, i have no confidence, and im really shy. I have a lot of friends, but i just cant talk. i just want to be happy again.