Am I qualified?

Over the last 16 years, people have asked if I'm qualified to teach __________ (fill in the blank with whatever I'm currently teaching).  When my kids were in second grade, I was a second grade teacher, and people would say, "Do you have a teaching certificate?"  I don't, but I think I can handle the second grade curriculum.  I have to keep learning and growing and changing as my kids do, so when they were in fifth grade, I had to become a fifth grade teacher.  The academic side of homeschooling has never been super difficult, but now that I have a student in high school, it's challenging.  It's been 30 years since I was in high school, and I don't remember it being this hard.  I have to be a high school English, biology, history, foreign language, driver's ed, P.E., and math teacher, whereas I had a different teacher for each of those subjects.  I have to do a lot of planning, reading ahead, and studying in order to know all this stuff well enough to teach it.  It sure makes me use my brain! 

Most often, the "Are you qualified?" question comes in the form of: "Are you qualified to teach higher math?"   I got A's in math in high school, but my college degree is in English.  Honestly, the subject I've had the most trouble teaching has been math.  I like it, but sometimes there's a problem I have trouble figuring out.  Usually if I spend extra time studying the student book and the teacher's manual, I can do it, but if I can't, I ask the principal to look at it.  Sometimes he gets it or we talk it out together and get it.  Once I had to ask a friend for help with a biology problem.  Sometimes I can google an answer.  But there have two or three times when I've had to take it to the next level, which is emailing the guy who wrote the curriculum.  I established a relationship with him a few years ago when I wrote to the company about a problem with the curriculum, and they connected me directly with him.  We exchanged several emails.  He is very smart, patient, thorough, and open to my questions and comments.  When there is something I can't figure out, he'll send me a long, detailed explanation. 

So am I qualified for this huge responsibility?  I don't have a degree in education, and I don't have a teacher's certificate, but I love my students and want the best for them; I'm committed to them; and if I don't know the answers, I know how to find them.