Instead insert something like this pseudocode into your gameloop:

int iLastTick;
int iCurrentTick;
int iSecondsBetweenShots = 1;

iCurrentTick = GetCurrentTickFromClock();

if (((iCurrentTick-iLastTick) >= iSecondsBetweenShots) && (IsPressed(Key[SHOOT]))
{
Shoot();
}

iLastTick = iCurrentTick;

----------------------------
I use a variant of this and it works great.
This pseudocode can also be used for animations and other timed events.

if (BulletX == EnemyX) && (BulletY == EnemyY)
Because that will check only if it hited to the most upper left point. What can I do?
Please Help me!
Thank you!

If you know the width and height of your sprite (you must surly) then to check all you need to do is check if shootx >= shipx and shootx <= shipx + ship width and shooty >= shipy and shooty <= shipy + ship height