My feet are in the ground, what is wrong?
You need to adjust your offset in Z direction. This is done in following way depending of the choice of viewer:
Phoenix : Preferences (Ctrl+P)>Phoenix tab>Avatar tab>Adjust the Z modifier
Firestorm : Click the Firestorm icon on the bottom bar>Raise your height offset
SL official viewer : Open the developer menu through the Advanced menu (Ctrl+Alt+D), there is an option towards the bottom. Develop>Avatar>Character Tests>Allow Select Avatar. Then hold Ctrl+3 to start the editor. Click on your avatar’s body and adjust the number
Singularity : Preferences>Vanity>Body Dynamics
Exodus : Click the tools button>Move the ground offset slider to the right