Getting Bitter

Does anyone else get bitter. I've been trying for 9 mos and me and my SIL do not get along - I think she's a snob and a spoiled brat and she gets everything she wants at the drop of a hat and she just found out that she's pregnant. This is going to kill me to watch her progress and I just wish I was pregnant already. I should be happy for her but I'm not. I find myself wishing something would happen that she would know the feeling of struggling and I don't want to be that person to wish bad things in people but I'm extremely aggravated - sorry. Just needed to vent. 🙄