|Dedicated video memory is something that is part of a video card that would be instaled on your computer. If your system uses graphics on the motherboard or on the CPU die then it is using shared memory for the video and your problem is as much that it does not a distinct graphics engine that is strong enough, quick enough, as well as not having access to enough memory.|
If your system is a laptop then you are in trouble because you cannot change this fact.
If your system is an All-In-One PC that is integrated into the monitor then you also cannot change this fact.
If your system is a desktop and not an itty bitty miniature one, then you MAY be in luck.
If this is the case, please post the make and model number of your system and we may be able to make some suggestions on how to handle an upgrade to your system. Please include your expectations on its gaming ability and your approximate budget you can spend to help us be realistic for you.
If you have one of the first two listed above then you will have to wait until you can afford a new gaming level desktop or laptop (ask for advice on this when you are ready).
You have to be a little bit crazy to keep you from going insane.