(((((((Colleen))))))))))
You are no ogre.
Maybe it does seem like you're the reason people aren't in your life anymore... but it takes two people to fight, and so you can't take responsibility for the whole thing.
I'm truly sorry you're aunt has passed away.. but she didn't pass away because of you. Her passing is not reflective of your relationship, and so although you're hurting from not having her in your life... its not your fault.
As for your other aunt... you said it yourself, she's bipolar. She has her OWN issues. I read this great quote over the weekend "you can't compare yourself to others because you don't know what journey they are on." Ultimately, it was your aunt's decision to claim to not "need you in her life", but i'm positive that there are other factors that are contributing to her decision. These other things could be completely separate from you or your mom, but it is her inability to deal with life stressors and as a result she is taking them out on you. It's not right... not right at all, but its not entirely your fault, if at all.
Just look at the relationship you have with your mom... do you honestly think she would be sticking around and supporting you if you weren't a good person? Absolutely not. Look at yourself through HER eyes of love...
People are going to come in and out of your life. Some of them you're going to get a long with, some of them you're not. But whether you do or you don't isn't all placed on you. Other people have their own struggles just as you and I, and its a multitude of things working together that can affect relationships.
Try and not take this all on yourself. You are a good person, and you do have people in your life that support and love you. Lean on them in your time of pain, and trust that they love you because you are worth it... because you are NOT an ogre.
