The effectiveness rate for the various products that claim to increase penis size is about zero percent. There is no medically proven pill or supplement that increases penis size.
Vacuum pumps can make a penis size larger, but at an awful cost. They will stretch the tissue, and damage it, causing loss of full erection hardness and also causing scar tissue within the penis shaft. Guys who use vacuum pumps to excess can eventually have semi permanent erections that never really go down, and never really get fully erect. Enjoy what you got dude, most guys who think they are small are average if not a bit above average. Guys who claim to sport 7 or 8 inchers generally are lying. Most guys range from 5.4 to 6.2 inches. 76% in fact, so if you had a lineup of guys drop their pants and get erect, 3/4 would be within an inch or less of the same size while maybe 12% would be a bit smaller and 12% would be a bit larger. Very few would be huge.