I totally agree!
At one time in my life, I thought that I’d do
anything to trade some of my thickness for just one more inch of extra length (Heck,
half an inch will do! please, God, please?). The situation became a real issue at one point when girth was proving an obstacle for comfortable penetration with one particular girlfriend (Admittedly, she was quite petite and we were young and inexperienced, but I felt so much guilt for the pain and difficulty it was causing!

Sent me into a tailspin, wondering if something was wrong with me and all that.
But since then, I’ve come to feel that the extra girth has been a major benefit for me. It's my best feature!
As to your question about exercises to gain length, I’ve noticed a few other threads here talking about that sort of thing (stretching, kegals, I think). Maybe someone with some first
hand experience (pun probably intended there) with those techniques can offer some advice?