I’ve been struggling for years too in my 20s. I suggest reading ‘The Hackers Diet’ by John Walker. It gives you a systems view of diets. The most useful insight for me: setting a weight loss goal based on the fact that a kg of fat is 37 MJ of energy. Want to lose a kilogram a week? You have to make up that 37 MJ deficit then. Ie. I need ~13 MJ of energy per day to subsist (calculated using an online tool). I subtract (37/7 = 5.3) from that daily energy requirement and arrive at 7.7 MJ per day that I can eat. I stick to that intake goal EVERY SINGLE DAY and I lose weight. It helps to keep punching your small energy intake amounts into a calculator (phone or watch) and keeping a running total that way. I’ve gone from 92 to 84 kg in a couple of months and it’s not that hard. Strenuous exercise doesn’t really do much when your energy intake is way too much to begin with. It all starts with the intake. Exercise actually doesn’t burn much energy at all.

Stop eating carbs: bread, crackers, pasta, cereal, fruit, juice, potatoes, sugar, starchy vegetables like beans, peas, corn, no sodas, no alcohol. Once you are at your target weight, you can go back to eating the things that are nutritious, but no junk.

If combined with a confined window of eating, like 11am to 5pm, you'll lose weight faster.