I can tell you that I felt the same way and I was in the exact same position that you are in now. Today, I am currently taking 150mg of sertraline (Zoloft) daily and I no longer feel that strongly about it as I once did. I had struggled with severe OCD symptoms for about two years before I finally caved in and had no other choice, and, thankfully, I credit the medication for probably saving my life as I was close to just ending it all. I am very sorry you have had to deal with it too, and I am very sorry for your loss.
The fact of the matter is, taking medication, actually, ANY medication doesn't make you weak. This is something I thought I would never say. To be able to have come out on top and have a better life (albeit with some very hard times) is worth more to me now than the reluctance I first felt to taking the medication. You have not failed in any way, shape, or form, and the fact that you are sticking with the medication proves you are stronger than anyone else who is blessed enough to feel happy without needing it. Your brain was not wired correctly in order to carry out necessary functioning, and that is not because of your own inability to be happy or stable. As for those who say you "have" to take it, you really do not, unless you want to live, just as if a patient with Stage 4 cancer stopped their treatment. Nobody has to do anything in this world, but we do the things we do because we want to stay and feel alive. I know and remember how hard it was at first, as I felt as if I had completely failed, and like you this only made me feel worse. I am so sorry about this; that you are going through the shame as well. All I can tell you is that this feeling dissipated as I saw all of what I had felt and missed out on because of severe OCD and depression was far worse to look back on than my resistance to getting something I needed. I can't even begin to recall how unhappy and distressed I was. The whole world became like a horror movie, and I was just stuck, trapped in it, with no way to escape.
When I started taking sertraline, things started to change. Within days others started to notice a change, and I too would feel it within the coming months. I still struggle with OCD every single day, but I can live my life now, and that is an exceptional thing. Taking medication isn't a shameful circumstance for me anymore. It is almost as if OCD threw that thought at me too so I would never be happy, but it was so worth it to experience the joy that I haven't felt for years. You are anything but pathetic, and I wish someone would have told me this when I was suffering so much. I hope you can one day look back on this, and know that you were never alone in feeling guilty, but that the guilt was not worth the pain.
-Stampy