guys, my weight 181cm and my weight 50kg. gain 2cm and 5kg since form 5(8 years ago). i know im seriously underweight.

care to comment on my daily intake? what food i should add into my daily intake.
7am = 1 slice of cake/2 slice of bread with peanut butter + 1 glass of coffee.
7am-1pm = no chance to eat. workplace dont allow me to have break to eat.
1pm = (chicken rice with extra rice)/(1 piece sambal chicken(breast part)+2 type of veges+rice)/(mee goreng)+coffee+fruits
2pm-6pm =  no chance to eat. workplace dont allow me to have break to eat.
7pm = scramble egg+2 type of veges+ (2 chicken breast meat/1 whole fish)+rice+a glass of water
10pm = 2 cups of ice-cream + fruits + milo
1)i easily get full when eating. so got what food which can help me gain weight but doesnt make me full easily?
2)near my workplace only got chicken rice stall,mamak restaurant,bah kut teh restaurant.
3)if go gym and take weight gainer is enough or i have to add more supplements?
4)my daily plain water intake is 500ml. will it effect my weight?
5)my daily exercise = go up and down 2 floor stair case at least 10 times during working hours. i know im pathetic

i know i have to eat more but i cant cos i feel full easily. anyone know any gym which have special program for people like me to gain weight?
every girls feel jealous of me~~

but...
im a guy...haih~~
love to go to beach but cant cos im ashame of my body. haih..