For those who have lost a parent..

Is there ever a sense of guilt that maybe it should’ve been you and not them? Or thinking it should’ve been the other parent? Am I a bad person for thinking those things? I feel awful about it, but it’s so easy to blame myself when I grieve.
Follow up: how do you react when people tell you to “get over it”? I’ve heard this said to me many times and I never know what to say but my jaw always drops. It’s crazy that people who have never experienced loss think you can just forget what happened with time. No. You never do. It gets better, but you never forget.
Any help or answers are welcome. Thanks.