Is most of what everything is made from in another dimension? If there are eleven dimensions as M-Theory asserts would that mean that the majority of what we are made from exists in the seven other dimensions? 
 A: 
If there are eleven dimensions as M-Theory asserts

Let us suppose it is true

would that mean that the majority of what we are made from exists in the seven other dimensions? 

Define dimension:

In physics and mathematics, the dimension of a mathematical space (or object) is informally defined as the minimum number of coordinates needed to specify any point within it

Take an ant walking on the table. 
All of what the ant is  made from exists in three dimensions, although one of the three dimensions has boundary conditions on the length of the coordinates needed to describe its (x,y,z); the third dimension describing the body of the ant is bound within a few millimeters, the size it can stretch in a third dimension.
In an analogous fashion, if eleven dimensions are true, ALL of what we are made of exists in all the dimensions, i.e. has a coordinate point in all dimensions, except, (since we do not interact with 7 of them) in seven of them the length of the coordinate line needed to describe our (x,y,z,t,a,b,c,d,e,f,g)  coordinate location is ,according to the theory, very very small.  In addition, the theory curls the extra dimensions 

In the limit where these curled up dimensions become very small, one obtains a theory in which spacetime has effectively a lower number of dimensions

the ones we observe currently.
So we exist, have a coordinate, equally in all dimensions, but are aware and interact within the space time we have recorded with our experiments up to now. We are in a worse position than the ant in three dimensions, as our extra dimensions are so tiny we cannot record interactions with them, as the  ant can, by climbing over branches of a tree.
That is, if M theory becomes the theory of everything.
