17, Is it fine if i take mass gainer shakes?

Those workouts are pretty useless, following a proper program would be much more beneficial.
Yes they are safe but its alot healthier and cheaper to make your own.

what would you consider a proper program?

U have access to a gym?

no, but I have a bench and can get weights.

How heavy?

I used to do 3 sets, 12 reps of 8kgs a couple of months back, but I can get however heavy I want, I wanna completely revise my weights workout, dunno to what tho

can u get a rack too?

got that too

Alright nice then you can follow a normal gym program pretty well. How many days would u like to work out?

5 days a week

I mean protein shakes aren’t exactly gonna kill you but I don’t really think you need it, especially at this stage. There’s no substitute for real food so you should be focusing on eating more and and obviously working out as well. What are your goals? What is your nutrition like at the moment?

I have attached a program for any machine/cable exercises u can look up replacements.

They're just whey powder, sugar and vegetable oil. Perfectly safe unless you have advanced kidney disease. More than 100-200 surplus calories per day will probably just become fat though.