Hello, I need some help, a lot actually.

On this site I am a 1600, and I know that the ratings on here are inflated, so lets not get into that discussion, but I feel as though I am an a fairly decent player. I also feel as though I understand positional concepts alright-ish(relatively speaking, I know I have sooooooooooooooooo much more to learn about everything!!!), and my abilities in other areas are not exactly horrible. I play at a local chess club and I play at a fairly proficient level there, ocaisionally beating higher level players.

My problem is that it seems that when I step up to the tournament board I lose all of that. My USCF is currently 1075(P21) and I have only won 3 or 4 of my games. I almost always lose on some completely avoidable and simple material blunder that I could normally avoid in my sleep.

My question is, do you have any advise as to how I can stop stumbling under "tournament pressure."

I thank all in advance for any advice/encouragment.

Yeah, that is helpful(sarcastic, judgemental face, possibly with fluctuating raised eyebrows).

First block meta_ridley so he cannot muck up your threads.

Lots of advice can help. If you are dropping pieces, perhaps you are moving too fast. Perhaps you need a system of checks that you you laborously follow every move.

how do you block someone?

I guess it comes down to experience.  Before I played in a tournament I used to see someones' game (rated a few hundred points higher than me) and they'd miss some tactic, and I would be confused because I didn't miss that stuff in 3 minute chess.  But in long games there's so much to consider that we can get a blind spot for the simple stuff.  To fight it you have to form a few habits for long games. 

After you've finalized your decision and chosen your move, sit on  your hands for 10-20 more seconds and do a blunder check.  Forget all the stuff you've been looking at, flush it all out of your system, and just visualize that one move you plan to make.  Now look at the entire board (it's likely you were focusing on the area of your planned move) and notice each of his pieces, look at all the tactics your opponent might have for that one move you plan to make.  Look at every check and capture he has.  Of course you checked before while thinking, but this should be the last thing you do before actually reaching out for the piece to make the move.

The more you do this, the faster and more natural the process is.  Just be sure to make it a habit and do it consistently.  Some players 200 points apart can have the same knowledge and skill, the only difference being consistency.  If you only do this 9 out of 10 moves, you'll drop one or two pieces a game

It may also help to not use the analysis board for your CC games, or at least use it less or not as the first thing.

In the past Ive had a vision problem on 3d boards vs 2d computers.. the solution was setting my games up on a real board

I had the same thing, but over time you get used to both.

A lot of it is experience, getting rid of the nerves or at least getting them under control. 

How are you making these blunders?  Are you moving too fast?  Try noting your time at every move, or every five moves.  Figure out what your average should be in that time control and try to be close to it starting around move 10 or 15 (or whenever you are out of your opening preparation). 

If you are falling for easy tactical tricks, use the Tactics Trainer or other exercises to sharpen your eye.  If you're just hanging pieces, try the "blunder check" review before making the move.  If you are falling to attacks on your King, why?  Are you moving the pawns in front of him too much, or failing to leave a minor piece as captain of the guard?

Go over your games and try to figure how what the heck you were thinking when you blundered, and see if there is a pattern.  There probably is, and once you see your weaknesses you can work on them.

Thanks to everyone who answered. All of the comments were very helpful.

For blunders I think the best advice is, don't move until you have decided how your opponent will respond.  When I was first told this I thought I already do that.  But when I actually paid attention during my games I noticed I really only did that on exchanges or as patr of plan, almost never in other cases.  So, once you decide on your move.  Stop.  Picture the board and then look for your opponents best response.  Do that mental process for each move and basic blunders should be greatly reduced.  Then you have to work on not becoming too reactive to any perceived and imagined threat.