I did my taxes in February. And it said it's still processing! What do I do? It's now june.

Is that what it displays at the IRS "Where's My Refund" website?  i.e.,when you use the tool at the IRS website below, it says your Federal return is still "processing"?

http://www.irs.gov/Refunds

If so, you can phone the IRS to see if you can learn the reason for the delay.

IRS:  800-829-1040  hours 7 AM - 7 PM local time Mon-Fri

When calling the IRS do not choose the first choice re: "Refund", or it will send you to an automated phone line.
 
First choose your language.  Listen to each menu before making the selection.
Then press 2 for "personal income tax".
Then press 1 for "form, tax history, or payment".  
Then press 3 "for all other questions."
Then press 2 "for all other questions."  It should then transfer you to an agent, but there is likely to be a long wait.

I usually use a speakerphone so I can work on something else while waiting.

If you don't get good results from the IRS, you can consider contacting the IRS Taxpayer Advocate Service for assistance.  At the following IRS website, find the USA map and click on your state, and it will give you the number of your IRS Taxpayer Advocate.

http://www.irs.gov/uac/Contact-a-Local-Taxpayer-Advocate

If you are unsuccessful with the Taxpayer Advocate for your area, you can also try the special IRS phone number for the Taxpayer Advocate Service at  877-777-4778.

More info on the Taxpayer Advocate Service:
http://www.taxpayeradvocate.irs.gov/

http://www.irs.gov/Advocate/Taxpayer-Advocate-Service-6

Also see this article for more info on how the Taxpayer Advocate Service works::
http://www.irs.gov/taxtopics/tc104.html