I don't know what this feeling is but I when I go to the game store and purchase a new game. I play it for about a day and move on to something new and new. 

Basically I have a hard time completing games...is that normal or what?

I have a bunch of games, I recently bought a original Xbox so that I can play Fatal Frame 2 and Chronicles of Riddick and I bought a few games on the Xbox 360 and PS3. And I'm borrowing a few games from my cousin DMeisterJ for the Wii...

I tend to complete games, but my interest seems to lose after about 4 hours in a game. And I just go on to another game once I go back to the game store.

Is it normal or am I losing interest in this hobby?

I had the same issue for a while. It might be a good idea to try some different genres to spice things up (that was weirdly worded). I used to always stick to RPG's and had the same issue. After allowing myself to try every good game that comes out instead of just RPG's, I found my gaming interests went back to the way they once were.

You may, you may also just be burnt out at the moment. Consider just taking a break from playing videos games for a while, or maybe just play simple and short ones if you're having trouble finishing them. Like flash games on the internet.

I mean...I tried SRPG's like Final Fantasy Tactics for the PSP....and I just couldn't get into it. It was decent for a few days and then I got mad at the battle system. I just couldn't get into the whole moving your character around with blocks, it was like chess...it was boring. So I traded that in.

Now i haven't been on my 360 in a couple of days...idk...I will try some new genres. I haven't played a RPG yet.

I'm still trying to decide whether I should make a list of games I want or should I get someone to recommend me some games or should I just go buy game reviews.

You're normal. The day you don't feel like playing any game (old or new) is when you're losing interest. I know that feeling. The list of games I haven't completed is endless. Most recent mentions are Oblivion, NG:Sigma and DMC4. In DMC4, I stopped at chapter 20. In Oblivion, I quit just before closing the first Oblivion gate. In NG:Sigma, I quit at about ch 13 which was understandable because it's just like the original NG (which I had already finished) and the dual katanas ceased to be fascinating.

I forgot to mention Enchanted Arms...I could only bear four hours of pain along with the gay guy's voice!

EDIT: Despite all these, I've sunk days into SCIV and COD4!

No, it's not normal, and you're not losing interest in the hobby.

The problem is that you like to be constantly entertained by new things, and can't stay focused on one game at a time. Which I've told you before cuz :P

Well consider this, I haven't played the Xbox 360, PS3 and Wii in a couple of days. And I need my glasses when playing the Wii, so I can't see real well when staying 10 feet away from the TV.

I got bad vision...lol

Awesome, I think I'm more into the short burst games, like something simple and fun. idk

Then what can I do to fix this!!?!

It's annoying right now, my mind is going crazy!!! I have so many games!!! and systems

lol...I've sunk more hours into Halo 3 and WWE Smackdown vs. RAW 2007 than any other game combined...lol

I haven't touched Brawl or Warhawk yet!! Whats wrong with me...I need a fix right now!!!

 There's no fixing, if you don't feel like playing a game...don't. Perhaps, something else would release in the near future that'll recaptivate your interest. Everyone has the games that keep them playing.