Pain at lower back. Or a muscle pain?

I am 25 year old male. I have a mild pain in my lower back right side near waist. 2 days ago i felt a pain in the waist after waking up in the morning and pain occurs when i was sitting. I used omni gel and that pain went away. But from today morning i felt a mild pain in my right lower back side and also in lower right side. It occurs when i walking or bending the body. And also it occuring without any movement of body after a interval of time continuously. And also it occurs when i breath deeply. My appetite is good. I have no urination problem. But i feel a burning sensation while urination sometimes but it happened very few times. And i feel a itching sometimes at the head of my penis. But i feel a little tired in evening to early night. I am too much worried about this pain. Is it a matter of kidney or a muscle pain?? Please help me.