There are people who will like to impose their beliefs, views, opinions, pains on you. They will tell you how unrealistic your own beliefs and thoughts are or say something like, "don't worry, you're still new in this; just know it won't last long".
Dear friend, that is when you must hold fast on your affirmations! That is when "I know who I am comes in"! Because someone has more words to say in seconds more than you doesn't make them right!
There are too many blabbers and noise makers out there, and you need not argue with such people or worse, join them! Just counter the negative opinions they want to impose on you before them, and walk away- I mean go on winning!