but let's say I have a cold wallet with 1 bitcoin on it. Could someone somehow change the code in a way and make it into 2 bitcoin? Like to me it just seems like a number that represents the number of bitcoin you have.
Thank you for bearing with my stupid question, but it's been bugging me for a bit.
No question is stupid and everyone always has something to learn from every discussion.
About changing the protocol, this can not possibly be done by any single person, if it could, then Bitcoin would have little or no value as everyone can create their own. Each coin is immutable and non fungible.