hey Meagan, the main issue I guess is that you put everyone first, that what causes resentment. start by just accepting reality and dealing with what is!! Remember there’s a lesson to learn in every experience. holding onto the pain will only cause you more pain. first of all always remind yourself of this; I’m only dealing with the now and the now is that your mom is away and you need to take care of the family, but first of all take care of you!! how old are your sisters??
start loving yourself by giving yourself time for you, and I mean that you do things you love and unwind with them. I go to the gym to unwind and visit friends sometimes or maybe read abook or even listen to loud music and dance and and meditation is absolutely essential. forgive yourself for carrying all that resentment towards whoever is causing you pain or caused you pain and start repeating I’m at peace with the process of life!
do not hold on so tight on the pain just accept it and see what can you do to deal with it, you’re the only one who’s responsible for your happiness. always think action, what can I do to be at peace with this?
start by maybe writing all what hurts you on paper and noo need to send those, write how you felt in details and all that hurted you from all concerned. at the end write to them how much you’ve missed them and end it with “I love you” I’m sure you do Meagan!!
focus on you and change will start to occur. forgive yourself and be open to the love you recieve from others, the change will happen and you won’t believe how loving and forgiving yourself works miracles.
I hope that was helpfull.