Why can I not ejaculate when lying in bed?

Try masturbating in another position like sitting.

1

gravity point it downwards

Not sure. Normal for the penis to point upwards, since that is the normal angle for penetration of the vagina. So you want to practice in that position. And sure don't push it downward, that can damage your gear.

just need more practice have fun working on it

urine after u have an erection ? that is not right, especially if it comes with ejacutlation. the bladder is blocked during erection to prevent urine from interfering. maybe you should see a doctor.

BUT dont worry it all depends on ur developmental stage. here is the thing, if u are just starting puberty (ur weiner just started growing) u probably wont have enough semen production or enough pressure to fully release ur semen whatever the position is. I would wait another year. but the urine thing is not normal. DO NOT be ashamed to see a doctor, trust me when u get older and u realize how silly it is to be embarassed about telling ur problems to a doctor, ur going to regret not seeing a doctor earlier incase ur condition still persists or gets worse. tell ur parents its about ur body and that u need to talk to him/her privately.