dealing with being fat as a teenager

i am an older teenager, almost an adult and i have dealt with weight almost all my life. it has stopped me from enjoying my teenage years, i feel like my weight is truly holding me back from being my best self. my weight has been slowly increasing all my life. i weigh about 350 and i am obese. I try to be positive and i do believe regardless of size you can be beautiful and loved but personally i wish to be skinnier. I have trouble finding clothes, i feel embarrassed in public, i feel like i’ll never find anyone. all of this is because of my weight. i always say ill start a diet or work out but i never do. i see everyone around me eating what they want and it makes me feel unmotivated. i struggle with over eating a lot, i feel like i can’t stop eating until i am sick. i don’t feel full unless i am sick, and i have done this for so long that if i am not having that full sick feeling i think i’m hungry and i want to eat. i want to be able to learn to recognize when i am hungry or when i am not. i want to learn to hold myself accountable and stick to a diet. i am joining to subreddit for motivation. if anyone has any tips to help me get started on my weight loss journey please share them!. please note i am a teen so i eat at school and i am at school most of the day :)