Advancing my social skills

Lately I have been trying to improve my social skills even further, especially with women. And I don’t mean seducing them, but rather learning more general and advanced skills. I know a decent amount about women, how they associate emotions with most ideals and experiences, and relating to there emotions is more important than offering them advice when talking, and that self-disclosure can increase closeness (more so than men). I’m also fairly competent with body language, having read several books or videos on the matter. I don’t have a tremendous amount of life experience with women as I haven’t been around them steadily for the last 2 years, and haven’t had a female friend in even longer. But, one of my best friends has a steady girlfriend, giving me amply opportunity to improve my communication skills. She is 18, and has gone to private schools for most of her life, but she is very level headed and intelligent for her age. She said she is relatively happy with her situation in life, and isn’t they type of person to worry a lot. We get along nicely, but last night was the first time we really talked for any extended period of time. Our conversation lasted about 4-5 hours, and many personal issues were discussed

My first concern
During parts of our conversation, she would use a pillow or blanket to cover her chest, as she was wearing a tank top that revealed a good portion of her breast. This is a defensive gesture to create a barrier for protection as far as I know. I tried not to look, but the quick glance is inevitable for any male.

My second concern
During this conversation, we both told a lot of personal feelings and beliefs about our selves. Unfortunately, I have been struggling with severe depression lately, and fear some of what I said may have alienated her. Some of things I said were:
-I cant see much positivist in the world
-Sometimes I think about ending it
-My chances of finding a mate aren’t very good

She talked about:
Her 1st boyfriend, Her 2nd boyfriend, a very abusive relationship as she gave me details on her experience, Her moving to school to school and the difficulty of doing so, Her insecurities, Her relationship with her parents and their falling out, Her beliefs on religion and what her life means to her.

Most of the talking was done by her, and when I said the things listed above, I didn’t see any off putting body language, but I’m not a expert. She typically responded by comparing what I said to a experience of hers, then continued to talk about herself. I would like to know if I made her feel uncomfortable, or if she was to busy focusing on herself, and how to deal with any unspoken problems and further our friendship in both scenarios.