This might be long, but any advice for me?

Walaykum Salaam. Sister you are backbiting about your family so you are sinning by talking about them when they cannot defend themselves. Be careful of what you say. Listen to your grandmother, she's older than you and knows more about the world. What do your parents have to say about you wanting to be with a non-Muslim boy (regardless if he converts or not) and you being a director? Personally I do not think it's in your best interest to be a director as you will be interacting with non-mahram men which could cause fitnah and lead to az-zina.