Im 14 got football tonight at 7.30 till 8.30 and a football match tommorow at 12.30 i have back pain n the bottom right of my back help pls?

tell the gaffer.....he's the one who needs to know,  then if you are still conscience about it,    check with ya gp..

Give the training session a miss tonight and see how you feel in the morning. You are young so the muscle pain could ease off all together tomorrow and you can play. It's important to keep your trainer/manager informed though  

Tell your coach about it. If you're any good he'll want you to play through the pain. If you can't go, tell the coach you can't play.