Hello, I'm fat and i want to lose weight

Right now I'm 23 male, i weigh 275 pounds, I'm 5ft9

In the past 8 years i tried different diets, went to gyms, tried stevia, protein shakes and even xenical, most of them worked until i eat away my success.

Now i have a nutritional program which gives me 1800 calories of food everyday but because of the current situation I'm not losing any weight .

I desperately need the help of a professional because my urges to eat sweets and junk food overtakes me and i can't take it anymore, i don't want to be controlled by food.

Currently i don't have access to a gym but i have a bike, a jump rope, and the outside.

In about 4 months I'm moving to finland and i need to lose a good amount of my weight till then

What i want is to know:

• What exercises do i have to do to lose weight, i want to be eventually 210 pounds
• What are the do's and don'ts
• How to overcome my urges to not eat sweets and junk food
• Is there a way to lose weight without any medication or supplements

I appreciate any help you can give me

PS: i have weak knees and i cannot do a keto diet

Edit 1: Went on a bike ride today and could cycle for 11km and that's the best i can do for now

I'm planning to go one day cycling and one day walking for 6 km and try not to cheat on my diet, hopefully it will be enough for now

Edit 2: The kind people in this subreddit say that i can include my junk food but in a 200 kcal portion which ill try to do as well as a suggestion of a diet sugary recipes from https://chocolatecoveredkatie.com/

Thank you so much guys for the help, you have no idea how much this means to me