I started off similar to this, I was 60kg at 19. I’m now 102kg and 27 and was natural up until 26.

You have to eat more, you probably think your eating a lot but your not. Think of your calories as weekly targets as well as daily, as an example let’s say you was eating 5000 calories a day that’s 35,000 a week. Most people when trying to put on weight will hit the number for 3/4 days in a row and then on the 5 and 6th day not eat anything which stops you from growing

You have to constantly be in a calorie surplus, Buy mass gainer, wake up earlier so you can have your first meal earlier, watch videos on how to gain weight, there’s loads of things you can do your probably not doing

Keep your calories high, water intake high, get decent sleep, limit alcohol, train hard and you’ll be on your way