Dash,
Firstly, you need to know that I am transgender. I know quite a bit about all this as I have had to learn to survive.
Stop equating gender related stuff like a sissy fetish with sexuality. Psychologically, Gender and sexuality are unrelated. Also your sex is also unrelated:
Sex - Biological form of your body - Male / Female / Intersex
Gender - Gender is defined 'the relations between men and women, both perceptual and material. Gender is not determined biologically, as a result of sexual characteristics of either women or men, but is constructed socially. Gender is actually a spectrum and not binary as constructed socially in western cultures.
Sexuality - Who you are attracted to - Look up the work of Alfred Kinsey if you want to understand more about this.
To put this into perspective:
Sex - I am male as i have the organs of a male
Gender - I am Female - Most probably due to a hormonal imbalance in the first trimester of pregnancy. therefore., I am transgender and suffer from Gender Dysphoria due to the mismatch (In my case I am undergoing transition to sort this out)
Sexuality - I am predominantly attracted to those who are of the female sex (see above).
The Sissy fetish relates to Gender, not sex or sexuality.
in short, this is most probably hard wired and there is nothing that you can do to change it.
Am I saying you are transgender like me? No. I’m the extreme form but it is a spectrum. What we have in the Sissy fetish is threefold: A desire for something female (a transgender trait). A desire to be little - This tends to be due to upbringing. It is a desire for innocence among other things. Finally, many Sissy’s wish to cede control to another and / or be humiliated. This is a Submissive trait in common with BDSM and is more related to sexuality.
Hope that helps unpack this just a little. PM me if you want to chat offline.
DLE