Are they really stalking you ..or are you like every other kid today that doesn't know the definition of stalking!!! Online stalking is taken way out of context..reading somebodys Facebook wall and commenting on statues does not constitute as stalking!!! Them following you EVERYWHERE you go is stalking!!
Stalkers are usually mentally imbalanced. They tend to fixate on someone who was nice to them or they perceived as being nice. (Something as simple as a smile when passing on a street can set them off.) Since they are generally a little "off" it doesn't take much encouragement.
Document as much as you can about the stalking. Use your camera phone to take pictures and video. Write down time and dates of the pictures. Log any calls that your stalker makes to you. If you can record them. Take all the evidence to the police. Get a restraining order and keep documenting everything, so if the RO is violated he can be arrested.
they want to stay close and as informed as they can to the person they want, that they can't have, in hopes of a opportunity will come up where they can get closer. be carefull jealousy is a strong fuel!