Is it normal to secretly take/gather photos of girls and their feet?

When I was about 15-16, my best friend was a girl, that I'd known since the age of about 12. We were very close. At the beginning I thought of her more like a sister. But as time went on, I started to realise that she was actually very attractive. I started to have feelings for her, but never said anything, because I was scared of messing up our friendship. (As it happens it turns out that she also had feelings for me, which I found out much later)

I was utterly convinced that I could never say anything to her about this. Now around the time that I realised just how attractive she was, I also began to realise that I have something of a foot fetish. This was something that I felt even less comfortable telling her. However, as it happened, when I began to look at her differently, with feelings for her, and as someone that I was extremely attracted to, I realised that she had literally the most amazing pair of feet that I have ever seen in my life. (This still stands to this day)

I began to 'think' about her feet more and more, and soon it became part of my standard masturbatory habits. However I could never really remember enough to do them justice. Then, that summer, she began wearing skirts, and open-topped flat shoes, which she would constantly take off, or dangle from her foot. We met up in and out of school, and went to the park over the summer break with a few of her friends. One day, while I was sat there, I had an idea... If I was careful, I could take photographs of her feet on my phone. So that's exactly what I did; I took about 50-6o photographs over the course of the day, of her feet, from various angles.

The first time I kept them for a few days, and felt too guilty about it, and deleted them (Which I now regret, as there were brilliant photos). Then, the next time we met up, I did it again. After a while, it was quite a frequent occurrence. I ended up with a few hundred photos, and had began to move past simple photos of her feet, to her legs, to her face, or down her top, up her skirt and so on. Before long, I had a rather large collection of photos.

Eventually, I saw another friend of mine sat in an empty classroom that we all hung around in during free periods, sat on a desk, barefoot. I casually sat down next to her and began snapping photos of her feet, while talking to her, using the custom stealthed app I'd made for my phone.(Phone looks, for all intensive purposes to be off, but is continually shooting)

Now, jump forward a few years, and I still have the said collection, and have added a great deal to it over the years.

It now also includes various topless photos of girls from my old college, and even a few nudes of friends, most of which were found when they spread through the uni, a few claimed using other methods. Most of the photos get a little attention, but for the most part, I still look at the photos of my old best friend, although I've not seen her in some years now.

She's now engaged, and I slowly began to see her less and less, as I found it more painful than anything to be around her. (It's safe to say that I loved her.)

Is this normal? :/ I have, on numerous occasions considered deleted the entire collection of photos, and did at one point, but then quickly recovered the files. I have considered shredding the files beyond recovery, but always hesitate at the last minute.

I am not the pervert that this makes me sound to be, I'm normally a courteous, well mannered person that goes completely out of his way to help people out, and be nice to them, even if it sometimes means a great deal of effort on my part. I'm just kinda shy when it comes to showing my feelings for people..