Dude, you are literally 90% of your habits and your nutrition. THAT is you. Not how other perceive you, not how you look, not what you think, that is the trick.
Some tips: Eating fast food or sugary food from time to time is fine, but DEFINITELY eat healthy stuff too!
Fish, nuts, vegetables (especially onions) are healthy as fuck. Fruits like oranges or kiwi. You would be surprised how much of depression can be attributed to a lack of Vitamin C or lack of water or lack of sunlight. Drink a lot of water during the day!
Sunlight is important too because of the vitamins, so ocassionally go outside and just sit in the sun.
If your habits consist ONLY to jerk off and play video games to exhaustion you will not have a positive image of yourself. It is fine to do this stuff, but do healthy stuff too! Go outside and take walks. Go outside at least 3 times in a week.>>41115502
This, my parents taught me fucking nothing. Not how to clearn properly, how to eat properly, how to socialize and have confidence... NOTHING. I was kicked out into the world like in cold water. I never even fucking knew how enjoyable showers are, I thought they were work, but not I don't want to miss them. You can always change. I grew up not even fucking knowing what feelings are, going to school on auto-pilot, answer questions and not thinking for myself or even allow myself to feel negative emotions like anger or hate, even when it was correct to do it.
Don't do 1 mistake: Don't feel bad for taking care of yourself because you fear you could become a narcissist like your parents. You MUST take care of themselves, they should have done it, they didn't, you were their responsibility - they failed. Now you are your own responsibility. Don't blame yourself, blame your shitty parents.