Help a girl lose weight plspls

Hi everyone, apologies in advance for any grammar mistakes that you might find reading this as english is not my first language!! I(19F) have recently came home after college to my mom saying I got fat that I should watch out for what i eat.

I study in a completely different city and live in a student dorm and don't have much time on my hands but I still try to live my life the healthiest way I can. I ride bikes often, I try to cook for myself(even though I haven't got much resources and time), I go to the gym whenever I find some time (usually thats 1-2 times a week) and try to choose healthier options whenever I have to eat something.

Before college I weighted 75kg and was never actually satisfied with my looks since my mom was always the first to tell me I needed to lose weight. But after some time away from home, living on my own and dealing with stress from college I too noticed that I have gotten a little bigger. Today I decided to weight myself and saw that I gained 10kg. Ngl that almost made me break down crying as I was never happy with how i looked in the first place but if anything it made me realise that I have to lose weight immediately. I tried multiple times in the past but even when I lost weight (which happened almost never and when it did it was extremely slow and difficult) I would always go back.

If anyone has any tips, even if you think it's dumb, as long as it helped you or someone you know, please share them with me because I'm becoming desperate!!!!

I will also probably start going to the gym more often or attempt to get more physical activity in now that it'/ summer and I got more time!