It's not that hard to retrain yourself. You'll get it. I did a yarn over for years and years a non-standard way. When I discovered it I decided to switch to standard and now I have no trouble at all, and sometimes I do it my old way just because I want to.
Your previous projects are still fine, you just did them a little differerently. I think some people knit that way all their lives and it is not the end of the world. You can even keep doing it that way if you want. But it you want to knit the standard way you can switch in a short time with a little determination.