When you look in a mirror you are in front of it, and the focal distance is then positive. The image must be the same size as the part of you (or an object) shown in it. A concave mirror will have a positive focal length. The formula for magnification is = height of image / height of object = -1
However, if an image is behind the mirror, the situation is different. In any case, a convex mirror will have a negative focal length. Virtual images will be located behind the mirror surface. Negative magnification means that the image formed by a spherical mirror is real and inverted.
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