My family was supportive, but my boyfriend's family was horrible to me about the decision.
I did it without anesthesia, pain killers or the valium they offered, and the procedure itself was painful, but bearable. The worst pain was afterward as my cervix un-dialated (I'm sure there's a real word for that, but you know what I mean), which lasted about 20 minutes.
All the above were factors in my decision, but in all honesty, my main reasoning was the relationship problems. The "father" was physically and emotionally abusive, and his family was....to put it simply, crazy. I was terrified of being tied to them for 18 years or more.
Logically, I have no moral issues with abortion. Nevertheless, being called a murderer over and over did have a strong affect on me. For a few years afterward I went through periods of sadness and guilt, up until I got involved in pro-choice activism, and, through fighting for other women's rights, realized I was entitled to my own, without shame.