My dog, General, is a very pretty white German Shepard but the issue is that he never ever leaves my room. He is afraid of everything. If you move he flails his legs while running away. He knocks over chairs and pushes people out of the way.
He has been like this since we got him. Would anyone happen to have any ideas as to why?

how old was he when you got him?
and how long have you got him?

He was about a year old.
We've had him for about 7 years.

Quit beating him

Not funny.

probably mistreated before you got him
and there is very little you can do about it now
(should have been addressed when you got him)

this and the best thing you can do now is make sure that he is in a place that is comfortable and he is well pampered. some dogs never really come out of that kind of trauma. all you can do is love him and make his life the best that you can do for him.

Try introducing him to new areas whether it be in your house or outside. Make a habit of taking him to these areas everyday and spend a little time with him in them. Eventually he might get a little more courageous and venture out by himself.

Many reasons as to why, not sure why you waited 7 years to ask for advice though. There's many ways to fix this, and don't let people tell you otherwise! The only difference in training now rather then before is it will take more time and effort to overcome his fears. The more I read threads in this sub-forum, the more I realize how nobody knows wtf their talking about. There's tons of information on the net where you can read up on, I shared a couple of links. I can go more into depth on different exercises to try if you don't understand these links.

P.S. I just lost my White German Shepard last year, best dog I've ever had.

http://www.2ndchance.info/fearfuldog.htm
http://www.cesarsway.com/askcesar/anxiety/Persistent-Anxiety-and-Fear
http://www.raisingspot.com/behavioral-problems/shy-dog

kind of, but not quite.

keep a small (sealed) bag of broken treats around you.

as soon as you get up, get his walk out of the way (how much does he weigh? if he's particularly energetic you might need 2x hour long walks or more)

encourage proper walking behavior with a broken treat occasionally.

in the house:

only allow onto furniture to "cuddle" (if you allow it at all) when you invite him

reward calm behavior, and wean off treats once a cycle has been established.

if he continues to show fear in certain situations, keep note of them and try to have him recognize the situation in a positive light and give a reward for a calm walk-through.

remember he'll be as brave as you when you lead him through a situation, he's horrified if he feels you're a weak leader.