Go to a guitar shop or look online and you could probably find some pictures to help you tell whether its a classical or not. One of the differences I know between an acoustic is classical is the distance between the strings is wider on a classical then a standards acoustic.
If you have a regular acoustic guitar change the strings, if you haven't already. Since you are a beginner your fingers are going to get sore until they develop callouses. You should begin to develop them after a few weeks of consistent practice.
Good luck!