how to find my speech impediment and fix ?

I went to speech when I was younger but never understood why. As I got older they told me I didn't need it but I went back to speech class in middle school.

I don't know what type of speech impediment problem(s) I have or had, but still most people don't under stand me. Only my close family and friends do.

I remember I had problems pronouncing twelve, two..things with "tw" in it. I pronounced them with a ch instead. I'll say say egg (with a ae) or mix up worm and warm ...so my question is how do I find my impediment and fix it?


I'm sorry if this is hard to understand or read..