Depending on how tall you are, you seem to be reasonably underweight. I'm twice your weight haha. Anyway, it's completely okay to eat more if you're skinny/underweight, especially if you are working out or training often. The key is to eat healthy though. Try having a fruit or two before a workout too, it's great for increasing your energy; it's like a natural energy drink to get you ready for your workout!
Good luck.
Im 17 and I weight 65 kilo.Lol dont worry & dont eat too much.You'll be fat!
If you are going to eat a lot more, eat a lot of protein and drink a lot of water. Try avoiding sugary drinks and candy.
You need to know your calories and macronutrients first. From there, you can either cut(lose weight/bodyfat) or bulk(literally get big).
Get some more meat and proteins into your diet. That should help you gain some.
Eat some healthy snacks and food as you'll use up a lot of energy training doing your boxing etc.
Yes.
Eat more.
You will gain some weight.
yeah eat some more and you have to work out more , I mean 3 weightlifting per week won't help you at all.