Something Wrong With my Penis, Please Help?

I have been worried about my penis, since last night it's been feeling funny when it is against something, like my bed when sleeping, I get this pleasure feeling that is uncomfortable at the same time, and have noticed I have been flaccid far more often than usual, I usually get random erections throughout the day as I am 16 years old. Today I took a closer look at my penis and noticed that in the middle of the shaft there is discoloration (darker then the rest of it.) I have also noticed that for the longest time my superficial dorsal vein has not been "complete" it doesn't appear like this: ====== but rather like this: == == And in that space in the middle is where the discoloration happens. I am a virgin, and it all happened after I wore jeans after spending an entire summer wearing shorts and sweats. I have not gotten an erection since and am worried, I was going to try to induce one by looking at pornographic content but am afraid it will cause the bruise to worsen. Am I going to be alright?