This is the first time I'm playing D&D. As a result, I may have botched the stats of my character. I have a low Charisma stat. However, in my understanding, this should only be a modifier to how well I play my character.
However, what I recently heard my DM tell me was, "Yeah, that line was great and it would work but you have too low Charisma to use it." Several times.
I want to convince my GM that just because I have a low CH stat, that doesn't mean I can only say, "Me Grug, me smash."
How can I do that?
EDIT: Since there are questions about what happned, the tl;dr is: there was an unfortunate accident involving a ruler's death ("ruler" of a kobold "empire"), that we were accused of. However, the ruler died with the "help" of magic, and we were just simple adventurers (a warrior, a barbarian and a rogue). After asking around for a bit, it became clear that juuuust by pure coincidence, it seems that after the ruler's death the court shaman will take over, and that he has been the ruler prior to the coronation of the now deceased one. I don't remember what I said exactly, but I wanted to point out to the main general (who seemed reasonable, honorable individual) that maybe, just maybe this is too much of a coincidence and they, with our help if they so wish, may investigate the issue more.
I was told "yeah, that's great reasoning, but you have 11 charisma, so you can't say that.".