I guess I define "alone" differently. I used to feel quite alone with my problems and I kept silence and distance from others about those problems, leaving myself quite alone. It was rather self-inflicted "aloneness" I guess.

Finding a therapist with whom I could break that silence was a first step away from that solitary existence.

I don't know that I ever expected my therapists to "fully" understand what I had gone through, but that did not mean they could not hear me, and for someone who had lived in silence, feeling heard was life changing. I was okay with being heard by an individual willing to invest some time even trying to understand. And those therapists came pretty darned close to understanding me more "fully" than any other people in my life. That was healing.

Over time, largely due to my therapists' willingness to listen and give my own problems serious thought and consideration, an act which was so validating for me, I learned to reach out to others in my life when I needed support in my problems. They're different problems now (not quite as intimate or secretive I guess), but I feel safe sharing and asking for support from others for those problems for which I do need a listening ear.

So no, I no longer feel so "alone" with my problems. Do I expect others to completely, "fully" understand what I am going through? No, but I have found the human capacity for listening and just sitting with me as I face some very difficult times quite bolstering and strengthening.