I think because you have had it for some time and i'm assuming [although you don't say] that it has all this time stayed the same ,not changed shape or size or anything, then it is nothing to worry about. But please, DO go and see your doctor anyway. My son is 19. I have told him to check his testicles on a regular basis since the age of 14 and he has done. A few weeks ago he felt a lump. I made an appointment for him to see his GP. The GP felt the same lump. He has had an ultrasound scan and gets the results in a fortnight. But for the past two weeks he hasn't been able to feel the lump anymore. Hopefully it will be nothing more than a cyst. But I told him fair play to him for keeping up with a regular "feel" down there, to make sure there is nothing that seems different. It's really important for both males and females to check themselves regularly ,from their teens onwards. Don't just think you don't need to start checking yourselves until you're in your forties. Start doing it now.