To me what your providers do seems very dangerous in that sense that they are basically suggesting that you had a sexual trauma, which totally might not be the case. However, it is known that it's possible to implant memories to peoples minds about events that never happened by suggestion and later it might be impossible to discriminate which memory is actually true and which is a result of therapists suggestion.

PTSD is just a label and as a label, it requires a traumatic event. However, many people also accept another label CPTSD which does not exists in diagnostic manuals and which is a fuzzy term but in general means that the trauma is complex and it might be impossible to spot any particular traumatic events, although trauma symptoms are there. For instance, emotional neglect seems produce this kind of trauma.

The things you describe that you are uncomfortable of sexual things are not proof of sexual trauma. Sexuality is one of the most intimate part of the person. If the person was not accepted and was neglected then this can give rise to general low self esteem, problems with sexuality, interpersonal problems.

My personal opinion is that your T would do you much bigger favor if she would stop looking for a sexual trauma that perhaps was never there but work with the material that is there (e.g. emotions, memories) and try to understand their meanings.

The diagnosis itself is irrelevant, this is mostly only for insurance purposes.