^^^ what ranger says is true. they are spindly because they are reaching towards the light, or stretching. Marijuana needs at least 5 hours of direct sunlight a day to develop into a nice plant. They need more light bro. I have sen it done indoors, tho, when I met my wife, her brother had a 6 foot tall monster of a bush in his living room window, growing just with the natural sunlight that came in from the south facing window.
I also grew some decent smaller plants in my bedroom as a teenager that developed into some rather nice leafy plants. They had to go tho, because the neighbor noticed them
The key is that the window or room be on the South side of the house, so it gets the most sunlight... at least in my part of the world.