My thoughts on my stuttering.

My thoughts on my stuttering. I'm 28 years old male. Fairly successful in life in a well paying construction job. I've been stuttering my whole life and I feel like that's the last thing holding me back in life. I have a low to high stuttering range depending on my mood that day. I do not stutter when I sing which puzzles me. I find that I stutter less when I'm in a confident and happy mood. I think my stuttering is based on confidence and self esteem rather then learning how to talk fluently. Does anyone feel the same or have any tips?