If you're a college student you can remain a PA voter.

It's pretty late for requesting an absentee ballot though - you should have done it a month ago. At this point there's a pretty big chance that your ballot won't get to you and back in time (I know from experience, voting as a college student). So you must request a ballot as soon as possible. And if the ballot gets to you in time, I would consider sending it back via UPS or Fedex (call your county to ask if this is OK). The completed ballot has to reach your county by 8 pm on 11/8. And remember to follow the instructions exactly - use the secrecy envelope, and sign/date the return envelope.