You can always wait to buy one when a new moel comes out.
You say "I am starting to get really irriated with my current mac". If that irritation extends to making it unusable, I would say you need a new one.
But only you can decide when "want" becomes "need".
Only Apple knows what Apple will do, and no advice that posters are allowed to give will tell you exactly when a new model appears.
Basically... Make sure you have enough Free Hard Drive space for your Mac to Perform as expected...
Rule of thumb is about 25 GB +
so i currently have the 2008 macbook and it has been running extremely slowly...
This is what Apple has to say.
ds store > Why is my computer slow?
Thomas A Reed > Mac Performance Guide
i have 24 gbs of storage free on my mac so im going to clear a little more space out. i think a lot of it has to do with just getting a little old i dont think it has the RAM to keep up with everything i want to do. i took it to an apple store to find out how much it would cost to have it upgraded with more RAM and it just didnt seem worth it know that i was going to be buying a new one soon. my question is more whether there is an outstanding reason i should be waiting until the end of the school year to buy my computer as apposed to Feb or March
If you are happy with your current Mac and it does all you desire... then consider installing more RAM yourself...
Quite easy to do...
For best performance, fill both memory slots, installing an equal memory module in each slot.
It is Important to get the Correct and Matching RAM
Apple are known to charge a premium price... See here for purchasing RAM ...
That site also has videos on how to Install RAM should you need it...