Guys with bigger than average

So, I have about 10inches of length and about 7 inches of Girth. Everytime I go out with my friends (or my extremely busty fem friend) my dick goes erect and it just shows so bad through everything I wear, even spilling out my boxers. It's gotten to the point where my fem friend has asked me to look at it, give me head to see if she can take it whole in the throat (I am not complaining about these, if it seems like it) and even if I can give myself head. I am 5'10" and 230 pounds. Do you have advice? to avoid it spilling out and showing so much