jeez, 70g a day? i usually down a carnation instant breakfast each morning. perhaps i should pick up a package of beef jerky and die from sodium overdose on the way home from uni or something, i never get that much protein daily
2 fried eggs for breakfast is about 12g + a morning protein shake which is on average 20-30g depending on the brand.
ask your parents or whatever for some lean meats whenever they go to the grocery store, they will more than likely support your cause for trying to gain muscle mass, so don't worry too much that they wont buy you anything lol.
either you can learn to cook or you can buy some high protein boxed dinners and make yourself a nice lunch/dinner which are on average maybe 30g
and throughout the day you can make yourself more shakes/eat some protein bars which is another 20g for you. 70g really isn't a lot as long as you are having a typical 3 meal a day schedule.