N-Dimensional space - My blabbering

Came across this concept of 11-dimensional universe which the string theory predicts. eversince then have been wondering how can there be 11 dimentions when we can see only 3 of the spatial dimension, and can vaguely appreciate the fourth dimension of time. Wondering about it i can think of some two ways this is possible (possibilities that i can imagine), but have to read more to see what the science as we know talks about.

One possibility
Any N dimensional frame will have atleast one purely N-1 dimensional frame where the Nth dimension will hold a zero value. and there could be infinite apparent N-1 dimensionsinal frames where the Nth dimension have a constant value. For example lets take a 3-dimensional room with one of the corners as the absolute zero. Now if we take the wall adjacent to that corner, it can have values across its lenth and height but the breadth will be zero at all the points. So imagine an ant whose size is very close to zero. The ant moving on the wall will feel travelling on a two dimensional frame and cannot appreciate the third deminsion at all. And the room could be cut into infinite slices across its breadth, and each slice will be more like the wall except that the 3rd dimension is not zero but has a constant value. any observer who is limited to move across this slices cannot feel the third dimension at all. Similarly, we probably are in a 11 dimensional universe with 3 spacial dimensions that can have multiple values, one time dimension which also can hold multiple values (assuming going back in time is possible) and 7 other dimensions whose value are either constant or zero.

One another possibility
Another way i tend to see the n-dimension is to include a lot of non spacial dimensions. For example why not mass of an object is a dimension as every matter in the universe has got a mass (or atleast 0 mass :) ). Probably volume could be a dimension. So assuming mass as the fifth dimension say a jogger runs from a spacial co-ordinate (x1,y1,z1) at time t1 with a mass of m1, and loses some weight in the run while reaching co-orinate (x2,y2,z2) at time t2 where the mass becomes m2 we can define his movement even from the perspective of mass.

I dont know if the physicist already have some definition for the other dimensions. am still exploring. in any case, if anyone has a good idea of the actual N dimensions the theorists talk about please shed some light.Thanks.