> PLEASE TELL ME WHAT IS WRONG WITH MY CODE?

Andrea,

You need to debounce the switch. When a switch opens and closes the contacts
connect and disconnect intermittently at first. Put a scope on input and
look at the edge when you open and close the switch to see what I mean. To
fix this a little more software is needed.

Each time you detect a press pause for a short time and check again to see
if the switch is still pressed. If it is, then consider the button to be
pressed. Similarly each time you detect a release pause for a short time and
check again to see if the switch is still released. If it is, then consider
the switch to be released.

I don't know how long you should pause so a little experimentation might be
necessary.

- -Mark