The torment is in the wanting and desire for that very thing you have never had. It is in the impatience from the waiting and the fear that it will never come. The need that eats away at your soul every day you do without.
It is like before you learn to drive. You know it is possible, you have seen it, watched others do it, heard friends talk about it. You can imagine what it will be like to have the freedom you imagine will occur when you can do it yourself. Then even when you can drive, i.e. know how, you still need access to a car. Sure, you may not know or think about all of the things that will come with it. The cost of gas, insurance, maintenance, parking, keeping it clean, what it feels like to cause an unavoidable accident, etc. Yet the longing is there and you feel the consequences of your lack such as depending on others to provide transportation for you or not being able to go to places you want to or need to go to, like the grocery store, or the doctors, or even, heaven forbid, work.... Looking forward to getting to those places does not replace your need for being there now.