Sebastian said: “I feel very honoured to be given the opportunity.”
In July, he began the audition process for the BAFTA award-winning Channel 4 show, after his agent (Waring and McKenna) put him forward for the role. Filming is now nearing completion and and the eight-episode series is due to start on E4 in January.
He said: “My character was cast a week after everybody else. At the final audition, there are only usually about two people but there were five at mine.
“Because Skins is such a raw and realistic representation of being a teenager they expect you to come along and sort of be yourself.
“They cast you on who you are as a person. I’m not very similar to my character but I think there are qualities in me that I share with the character.”
Sebastian’s father, Chris De Souza, is a broadcaster and composer which meant he grew up with the arts and discovered his love of theatre at a young age.
He said: “I feel comfortable on stage – I think it’s possibly an inadequacy in myself that I feel more comfortable playing someone else.”
Sebastian will continue his A-level studies at St Edward’s School. He added: “I have always cruised along in education but I want to prove to myself that I’m able to get really good grades and give a really good performance on television.
“I have prepared myself for the fact that things might change – I’m not particularly interested in the fame this might bring.
“I think things might change but I’m keen that they won’t change in my head, I will still be level-headed. I feel so very grateful and I feel excited. I just hope the fans like it.”