I would guess your will to live is much greater than your willingness to abandon the bravery you already display by not giving up even though there are times when mere feelings try to drag you there.

OCD and anxiety can be managed and maybe even overcome, and that can help with depression. Do you know what kind of additional counsel or help might be available there at your school? Your dad might not understand what he calls "lazy" is actually just a symptom of needing some direction, and I once had the very same thing going on during my own senior year.