Followed By Some Bald Guy With Dark Tinted Sun Glasses

I'm 23 now and this happened to me when I was around 13/14. Bit of backstory so me and three friends the same age went somewhere for the day on the train, my memory is a bit hazy but it was either London or Brighton.

We live in a town called Horley so coming back we couldn't find one going to Horley and instead opted to get a train to Gatwick airport which was one stop off. Once we got there we couldn't find a train to horley so decided that we would walk as one of my friends knew a footpath that would take us to a residential area called Riverside which is in Horley and would only take around 15-20 minutes. We walked out to where the airport drop off area is and turned left to make our way to riverside.

As we begin our walk there is a little lake to the right of us and there is a stand for a flotation ring and we mucked around a bit and made jokes because stupid teenagers. I clock this guy looking towards us who was bald and was wearing black tinted sunglasses, we started to walk along the grassy foot path which is next to the train tracks with a fence between the tracks and path. Me and my friends notice that this guy is following us and we quicken up our pace, we keep walking keeping an eye until we come to a sty which we have to go over and where the path will then continue before you go over a bridge to the other side where it's then only a little walk to riverside.

After we went over the sty we look back one more time to see him standing on it just staring at us. He didn't follow us any further and he never said anything to us just followed silently.