how can i make myself ejaculate farther?

Well, that really depends on age and how far along you are in puberty (if you're not already an adult that is). Some will also say that your diet will affect your ability to get distance on your ejaculate. I often wondered the same thing, but I find I can get some decent distance if I'm really turned on. Its a mental thing really... but don't think anything is wrong.

Oh and also, when you begin to ejaculate, try to contract your muscles until you can't anymore, that usually helps me get an extra little bit of distance.