Dear Blackangel,
Emma has excellent advice.
May I add, please write down what is right with your life, in detail.
Emma is right. There is a world of difference between "feeling depressed," and "being depressed." A feeling comes and goes, and it is unwise to make important decisions based on feelings. Being implies that that depressed describes your intrinsic character.
Am not a trained professional, but I think your depression is a feeling, in that it comes and goes. But, anytime someone repeatedly feels depressed, this is a wake-up call to seek professional help.
There is no shame in seeking professional help and taking medication (I feel if someone takes medication, they should also be in counseling).
Have never been on medication, but I have been in counseling off and on my whole life, and I have no shame whatsoever.
Blackangel, we are here for you.
Your friend,
Monica