If you can't look after yourself, then.....you can't look after others. You're hitting the nail on the head there. By being here you are looking after yourself. By confronting your fears and facing your hidden torments, you are helping yourself. What you have to understand is that right now, you are helping someone, you are helping you, there is nothing shameful in doing this.
I know you are sorry; I know, we all know, because we all were too....there's no need to apologize to us, your story is your story and you have every right to share it. I kicked myself every day because I couldn't be out there where I thought I belonged, now I realize my biggest challenge is helping me. Try to look at it from the point of the people you feel you should be helping; they would want the person who is helping them to be well, to take care of themselves, they would not want you to be hurting yourself by helping them.
Now is the time to look after you. You have already taken the first step to looking after yourself by being here. We're here for you. Lean on us a little. It's okay. You need to.