What Does Lump On Tongue Indicate?

Hi,I am 21 year old male. Long time ago I've noticed a small lump inside of my tongue but I haven't given it much of attention up until now. It's very small (smaller than average pea) and it is not visible by eye from any side. It can hardly be felt by fingers, however I can really feel it my teeth going over it. It is located in the middle of my tongue, about half inch from the tip. I do not feel any pain when I press it.I would really appreciate if you could tell me what do you think it is.Thanks in advance.