I’m not a good fit for my family

Lately I have been thinking more and more about how I just don’t think I am the right fit for my family.

3 years ago I married my husband and he has a son from a previous relationship. His son is currently 11, and I feel like our personalities don’t mesh well.

I am really struggling with this. I feel like I am constantly bickering and arguing with both my husband and son and I don’t get what I am doing wrong. I mean the bickering has been soooooo constant it is even over something as simple as “hey guys I am going to go grocery shopping tomorrow morning at 8am”. And I get back:

“Why tomorrow? Why not now?”

“Don’t do it at 8 am, go after breakfast”

“Well which store are you going too? (I name the store) oh no, don’t go there, that store doesn’t have the popsicles I like”

“No no, go to X store because it’s cheaper”

I can’t even make the decision to leave the house without them disagreeing with my choice of day and time!! They literally disagree with me on EVERYTHING!!!! I can’t fucking take it. The food I make is never “right”. They bitch and complain about not having certain brands in the house, certain snacks, specifically BBQ sauce.... but then god-forbid if I spend too much on groceries I will get an ear full. Then my son chimes in “Why would you spend that much? Why don’t you shop the deals? You should really coupon” AHHHHHHH I WANNA RIP MY HAIR OUT!!!

They just make me feel like I am not enough. That I’m lazy, that I don’t try hard enough. I feel like I am in their way. I just feel like I don’t fit well with them ☹️