Struggling with Healthy Eating After a Road Trip

i just got back from a road trip and i always eat a lot on road trips so i gained like 5 pounds. i told myself that when i came back i would only eat healthy foods, workout, and i would only eat like 1000-1500 cals a day, and on the fist day back i only like 600 cals cause i had so much to eat on the trip and i did a workout too, but today i went out to this mexican place and had a huge burrito that was probably like 1000 cals by itself. i didn't want to but my dad rly wanted to take me somewhere and i couldn't say no so i went and all of their portions are super big. i just told myself that i wouldn't eat anything else when i got home but i ended up eating an ice cream sandwich and a chocolate chip cookie. i know that doesn't seem that bad but i told myself i would eat healthy and i rly thought i could do it for like more than one day but ig i can't and i'm rly frustrated and sad now. i wish we just didn't have any unhealthy food in the house but i can't ask my parents to stop getting it cause then they'll know i'm trying to eat less and they'll be worried abt me and just make me eat more. hopefully i can keep up what i did yesterday for the rest of the week, cause i have school next week and i don't wanna look fat