Not sure if you are a male or female but I know how much people feel self conscious to whether they are too skinny or really fat .
I am trying to gain weight as well , as I have realised how being skinny isn't a good thing and isn't all that attractive ( I’m not anorexic) now there is many definitions of perfect body, and to me I want a curvy body, sometimes my friends tell me how lucky I am to be skinny and to have small thighs and whatnot but I realised how much I envied girls with meat on they bones and curves, and silly me I haven't realised guys cared whether they were fat or too skinny , gaining weight may be hard for some people with fast metabolism, but especially annoying for people with slow metabolism .
People often expect that eating heaps of junk foods will make you gain weight fast, that is SO not true, it actually creates more fat and carbs in your body rarely make you gain weight but even worse it may clog your arteries and cause more chance of diabetes.
If you eat lots of sugary , salty foods , truthlly you can definitely gain weight from that but that’s the bad way to gain weight . Whats great is you can gain weight healthily , you can do this by increasing your
calorie intake by increasing nutrients and calorie rich foods in the diet. You need to supply your body with all the essential nutrients it needs for muscle growth and maintenance.
Increase your daily food intake of high-protein foods, healthy fats and slow releasing complex carbohydrates.
Steer away from heavily processed junk foods that contain 'empty calories' and are high in hydrogenated oils and sugar.
And most of all eat plenty of fruit and vege and drink lots of water . Good luck on gaining weight healthily :D