To which sort of "stuff" are you referring? BDSM or writing?
I got into writing when I was in my freshman year of high school. My choice to do that wasn't motivated by any sort of psychology, it was based mostly on boredom. I wrote in classes that were not challenging. I wrote in classes that I could pass without listening. I also wrote because I enjoyed it.
BDSM I got into (and I hate saying "I got into" BDSM) during my sophomore year of high school. Again, it wasn't a psychological need or determination that motivated my foray into BDSM. It was mostly curiosity and exploration. I enjoyed tying my girlfriend up while we had sex or took pictures. I also enjoyed having her dress in different sorts of clothing for me. My favorite was a red sundress that she had, without panties or bra. And she would do those things for me because she knew they pleased me and aroused me. From there, I started reading the Gor books. I happened to find them in a used book store near my house. I started reading the first two or three and by the end of the year, I had read the entire series, except for about four books. Needless to say, they were good reads and had some nice sci-fi values, but they didn't contribute to my appreciation of BDSM any at all.
My real appreciation of BDSM started in my second year of college. I started reading the books and really getting into practicing BDSM. My girlfriend at the time and I took turns switching roles, just to see what we enjoyed. I don't want to go into specifics about that relationship, except to say it ended poorly. It didn't sour my taste on BDSM, though. Every single relationship I have had since then have had aspects of BDSM in them, even if they might not have been BDSM relationships.
My story ends like this: I met a submissive woman online, in a chat room. She agreed to come stay with me and be my real life submissive. Over the course of the last three to four years, our relationship has evolved from dominant and submissive to husband and wife. We still try to maintain some semblance of a BDSM life, even though time doesn't really allow it much anymore. Life has a way of challenging you, either with a full-time job and overtime work, by immigration to your wife's country of origin, by preparing a business plan so you can open your own store, or by the expectation of your first child.
All in all, though, I like my life. I enjoy writing and I enjoy BDSM. However, my motivations for both were not related to anything of any particular psychological value. Just boredom and interest.