need help losing weight i genuinely don’t know where to start

Hi everyone! I’m a 19-year-old female, 164 cm tall, and I currently weigh 77 kg.
My goal is to reach around 65 kg in about 2½ months. I’ve been trying to lose weight since I was younger, but nothing has ever really worked long-term.
This time, I want to focus on building a healthier lifestyle instead of doing anything extreme or unsustainable. I know 12 kg is a pretty ambitious goal, so I’m trying to be realistic and prioritize habits I can actually stick to.
If you’ve been in a similar situation or have any advice on what helped you lose weight in a healthy, sustainable way, I’d really appreciate it. Whether it’s tips about nutrition, exercise, motivation, or changing your mindset, I’m open to hearing anything that’s worked for you.
Thank you so much! 🤍