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as bebop said, anger is a big part of the grieving process. it's a good thing that you can recognize it and acknowledge it. i've found it pretty easy to be mad at the dead at times- for leaving too soon, for causing me to be hurt. and i've also been angry at the world for awhile, for letting loved ones die. as long as you're expressing it, you're not turning the anger inward.
and there's no need to apologize because you think it might be getting old. we all grieve in our own way and our own time. your friends understand and are here for you.