Not being a supporter of psychoanalyzing and putting a label on every little thing in life, I tend to think my "fetishes" come from my successful exploration of things that are fun, interesting or generate pleasure. Sensation is a key factor for me as well.
Anal came from an exploration in the shower with my fingers when I was 9 or 10. The bondage/sensation stuff followed shortly thereafter. Everything I'm into now progressed naturally through healthy, personal exploration. There was no "defining moment" - no trauma, no episode with an evil aunt/mother/teacher/etc, no spanking by a school nurse in a white uniform - thank you very much Dr. Freud.
Generally speaking, I tend to define my own moral code and values without comparing my choices to the "social norms" as dictated by popular culture, media, popular propaganda, religion or government. To me, it's just obvious: Love others, accept others, don't judge (this is a HARD one) be a caring person, consider others, do no harm, keep an open mind, etc. - all are the driving forces. Living this way it's easy to form one's own thoughts around sexuality and things that are commonly defined as "fetish" by mainstream society. I call this individualism.
I consider many things "perfectly OK" that are commonly defined as "fetish" by others. Wearing rubber/chainmail/fur/sequins is a personal choice, style if you will. Tats and piercings are an expression of individuality - when not symbolic of acknowledged hate groups, etc. Wearing nothing is the same, yeah it shocks people but that is their issue, not the naked person's. Multi-partner sexual relationships and hybrid living situations are fine by me as long as all the humans involved are involved willingly and consensually. Don't even get me started on gender judgement!
I like the sensation of a painful enema - this isn't a fetish in my book - it's just pleasure. I do not like blood play so I don't. I am not into diapers. I like tight/restrictive clothing and some bondage. I like cock and pussy pumping. Etc, etc, etc. EVERY PERSON IS DIFFERENT and each has the right to determine for themselves what is OK for them as long as there is no harm to others. The definition of "harm" becomes a challenge here though... Am I being harmed by seeing your naked tits? Uh, no. Get over your puritanical bullshit.
Some may call these things "fetish" but I tend to think that is just another term some use to judge and label others - to "define them" and put them in a social category. By categorizing things and defining "normal" it helps societies behave and stay calm. Psychologists do it. Religion does it. Snoopy neighbors do it. It's all just government.