Welcome to HCM
We understand your concerns
I went through your description. I suggest you not to worry much. You should not worry much about such things. Ejection length depends on just one factor, and that is the viscosity of the semen. If the viscosity is less, or semen is watery, it ejects for a long distance. If semen is thick, it is sticky, it travels lesser distance.
Along with age, the quantity of semen and viscosity decreases. Emotions, anxiety
etc are also other factors. Bur there will not be any problem for the effectiveness of semen. I sincerely advice you that you have nothing to worry.
Hope this answers your query. Available for further clarifications.