Idk, this just happened and I wanna talk about it

So, I was just sent to Tesco to get some milk (we only like the tesco milk, and parents only do Tesco shopping on Saturdays, it's a routine) cuz we ran out earlier than usual, and mom said with the rest of the money she gave me I can get myself a pastry for breakfast/as a treat for walking to the store, so when I got to the store I picked up the milk then I looked at the pastries, and I wanted to be nice and get something for everyone to share, but cuz of Alice's diet, she wouldn't be allowed to have them, and I didn't have enough money left to get her something else, so I decided nobody gets anything, and I paid for the milk and went home, then I explained that and mom was like 'you didn't get anything for yourself for breakfast?' and I said I still had a bagel from yesterday, (already planned on having that for breakfast) and she said 'so no? when you did all the calculations you didn't get yourself breakfast?' did you not hear me? I said I wanted to share, so no, I didn't, I just shrugged and left and then cried because her tone upset me, she wasn't yelling or mean, but I didn't like it, idk, it was probably other stuff aswell and that was the final straw, I've gotta go downstairs again in like 5 minutes, so I gotta compose myself, after studying I'll go back to tesco and get dad a lil treat, cuz it's his birthday today and I feel bad not having gotten him anything, and he likes candy so win win, he gets candy, I get to not feel bad