You're definitely in good company! My DH and I each had our own houses when we were engaged. His was a total redo - he bought a fixer-upper with the intention to fix-it-up and then flip it. Well, you know what they say about best-laid plans. It was supposed to have been completed & sold before we left to get married, and that never happened. I did what I could to help him, but I was also a "little" busy planning our wedding! I basically had to plan it myself, which as you can see from the previous responses, is not unusual! Thank goodness for all the advice and ideas found on this site. If it wasn't for BDW, I don't think I would have been able to do it. However, if you're feeling overwhelmed to the point that you want to just throw in the towel, may-be consider postponing your DW, but not indefinitely! Set another date that's reasonable, and carry on. You would be amazed at what a little breathing room can do for your peace of mind.
Good luck and don't give up!