Explanation: Ok, so im a teenager myself and i sometimes start with proper punctuation because its just what I do. You shouldnt care what people think its your decision, Just be yourself and explain to them that is how you like to type and if they jugde you or anything just ignore them you should never listen to others words. Dont ever change yourself for other people. It might make them happy but it wont make you happy for changing your self you know. So, just stick with what makes youu happy!