I think there are MANY options out there---as many options as there are people in that situation.
I, too, chose adoption. My adoption is semi-open. I still miss my daughter--of course I do! I don't "regret" my decision, but I think every person has "what-ifs" about his/her life, and that's my biggest "what If".
Your choice, in the situation of an unwanted pregnancy, is going to hold sorrow no matter what choice you make. As other people have said, though... for some reason people think they have the right to share their viewpoint on such a personal issue.
At 17, I let people judge me, and it took a long time to crawl out of the guilt, shame, and grief.
At 32... I don't give an owl's hoot what people think of my decision anymore. I made the choice 15 years ago, and I made the choice from love of my child. The only person I should have to explain my decision to is my daughter.