Do you have any pain in your kidney area? Or in your lower back?
I don't know much about urine stream but if its accompanied by some form of discomfort it would be worth talking to the doctor about it as it could be a kidney stone in the early stages.

As for ejaculating, that sounds like "premature ejacualation". I think alot of guys go thru that in their teen years. Its like you just get so excited that you can't help but ejaculate as soon as you get an erection. That should get better with time and experience.

About getting pain in my lower back, that is weird because I do. Lately, when I throw a baseball or move my arm a certain motion I get an intense pain on my lower right side under my rib cage. The doctor said it was probably a pulled muscle but it still hasn't gone away. I thought if it was pulled it'd be gone by now.

Did you mention your urine stream or ask him to check your kidneys when you talked to him about your back pain?

I never mentioned anything about my urine stream =/

If your back pain remains for more than another week or so, or gets worse, call your doctor back and talk to him about it.