I'm in my mid-20's with 7" length and 5.5" around. If you are what you say you are then I can tell you that you are way above the average. In fact, you are bigger than 90% of men out there according to statistics. All of the girls I have been with think it is bigger than it is also b/c they have NO concept of how big inches are. Girls thought I was 8inches or over. When I look at it, it looks small to me because I am looking from a downward angle and from far away (i'm 6'2) and my hands are big. Girls usually have smaller hands and they put their faces inches from your thing when looking at it so again it looks a lot bigger to them. You are good to go if those are your real measurements. Remember, measure from top of pubic bone above penis and to the tip.
Also porn stars are not all as huge as they seem. They use girls that are TINY. A ton of the girls out there on film are smaller than 5'2 and some under 5'0. The guys are on the smaller end too (height). Then they use a ton ton ton of camera tricks. Slight fish lens, angles, etc. The reported lengths of porn stars are smaller than they are. The whole industry is set up to make it seem like guys with huge ***** will do more than satisfy a girl. She will talk dirty, say its huge, be super impressed, etc. They are trying to instill insecurity in our society so that they can profit off of sex products to increase size, duration of sex, lube, etc. They used to make money off of selling the videos, but now they just make it free and sell sex products. Most porn stars are probably anywhere from 6-9 inches. With very few if any hitting 9inches. They might be packing some girth..but again modern film has some dirty camera tricks.