Willow:

I'm sorry you're feeling pointless. You're not pointless.

And your badness won't go through your blood because you're not bad. Bad people don't care about others and wouldn't give blood to begin with.

Even feeling like you do right now, you thought maybe helping others would lift your spirits. That's the sure sign of a wonderful person right there. I know how you feel, with the depression, but trust me you are a good person and you'll get through this.
AD and Newtus:

I hope the voices calm down for both of you.
Erti: That's a great list! Although I think I already take care of myself with chocolate too often.
MedicalFox: I think it's great you want to volunteer but I agree that if it will overwhelm you that you won't be helping anyone.

I know what you mean about needed a set schedule. I don't think we're more vulnerable having bipolar. I think we run on a higher frequency. I think if society was different mania could be really useful, but with things how they are it just makes us non-functional. Maybe make volunteering a goal for when you have less going on. Like maybe once you finish school.
Junk:

I hope it goes well. I hate it when something is different and it makes you worry that you're in trouble. I do that a lot too.