Pelvic pain?

So this happens to me all the time. But it's something that comes and then goes away for a while. I've had this happen ever since I was little btw. So sometime when I have to go pee it's extemely painful. Like when I sit down it painful. But "pushing" it out just hurts so much from the area that I pee from (don't remember the name). But that pain also goes up to my bladder and then it like, idk how to explain but it goes the the left in one area and I feel like that's causing it. After I use the restroom it still hurts and it hurts to walk. This also sometimes lasts for days or weeks. It hurts before and after always.

The area circled on the picture is where it hurts whenever the pain shoots up.