hi SilasGabrael, welcome to PC
Many of us here have and are currently struggling with depression. We know how difficult it can be. I know that when my depression is bad, the tiniest bit of negativity from anyone else towards me can send me spiralling into hopelessness, helplessness and waves of self-doubt, self-hatred and self-pity. To have someone doubt your depression -- especially your family -- must be very painful, and that pain is probably being compounded by the depression itself. I'm not sure why your mother isn't seeing or accepting your depression, but I'm sorry you have to deal with that.
Do you have anyone else you can turn to for support? A friend or other family member who might be more understanding? Have you spoken to your doctor about the way you've been feeling, and if you have, are you taking any medication to help stabilize your moods? What about therapy or counselling? Personally, my counsellor has been a HUGE source of help and support, and quite often the only person I can turn to about many of my issues, some of which are family-related as well.
Keep us posted on how you're doing, and remember that you are not alone in this.