I don't view your dropping out as a failure. You valued yourself enough to understand that you couldn't handle it. I'm fascinated by medicine but I could never handle the cleaning people stuff either.

You're not doing yourself any favors comparing yourself to yourself to you brother. Every has their own path in life, their own strengths and weaknesses.

There are many careers in health care that don't involve the yucky stuff. Physical therapy for one. You can help people recover from pain and injuries.