Why do I have to be so stupid and promote all my pawns while his king is trapped then I make one stupid mistake and stalemate. Can someone help me so I don't make stupid endgame blunders.

Do you know anything about stalemate ? Where a King has no legal move is a stalemate=draw. That what happen in all these games here.

I know. At the end I kind of stop thinking. What can I do so I don't stalemate. 

Give your enemy king some space so that it can move around until you give the check that make the checkmate.

just pay attention..

You need to check for stalemates, see if he has any legal moves in order to avoid it.

on the 64th move ...Qe3 driving to king toward the corner (a8)

It's easy to get relaxed and make simple oversights in winning positions - or perhaps you get too eager to finish off your opponent and forget to look for the pitfalls.  What really stinks is that your opponents are getting rewarded for their dumb perseverance.  The next time you play someone who refuses to quit, just take an extra minute to look before you make your move.  In fact, you should wait as long as time allows even you've already decided on your move.  If they want to drag things out, so can you.

If you check him, it can't be stalemate.

I'm guessing he just doesn't know the basic mating patterns.

http://www.usefulchess.com/tactics/basicmates.htm

 that is true is only when  the opponent turn to move and  if no other pieces (usually pawns) can't make a move nor the king can make a legal move is stalemate.

yes, your problem is easily fixed. Play the mate in one when it's there.

In your first diagram you have the enemy king trapped along your first rank and either of your queens can zoom down to the first rank and deliver mate but then you try and promote a pawn? Why?

Finding a stock of mate-in-one puzzles might help you a lot. You don't need three queens on the board.

You should learn some basic mating patterns so that you know what you're trying to do when you get a material advantage.   Try Bobby Fischer teaches chess or use the tactics trainer here.

You play well enough during the other parts of the game -- it seems like someone taught you to take away free squares around the enemy king and then checkmate it.  This is good advice which helps beginners not aimlessly check a king around -- but if you follow it too far and take away every square when no other pieces are around it's stalemate. 

Like Padman said if you became familiar with some mating patterns it would help you out a lot -- the following puzzles are positions from the games you shared.  1, 2, and 3 are mates in one.  The 4th puzzle is from the same game as the 3rd but is a bit harder, it's a mate in 2.  Two different moves lead to mate in 2, but it only lets me have one correct answer.

haha I had the same incident once as the first one you showed, except I had 4 queens when I stalemated the poor guy. :P

Mr amandeep1 this is a nice game you had is was good. Stick with the turn based for a little while.