That really sucks, and I can't tell you why your experience has been different from mine. I'd guess you ended up around shitty people. And maybe it kept happening, making you feel jaded and/or reluctant to share with others, including those who may have been more accepting.

I'm glad you are least recognize that your girlfriend (hopefully "ex-" now) isn't as loving as she seemed.

I hope that you can find people to keep in your life with whom you can have those deep conversations about your feelings.