The right-back, who is set to feature for England Under-20s against Switzerland tonight, made his Baggies debut in the opening day victory at Nottingham Forest.
Since then he has gone on to start four more Championship games as he battles with summer recruit Darnell Furlong for a place in Slaven Bilic's the side.
And Ferguson – who first joined West Brom when he was just eight-years-old – admits he couldn't be happier with the start both he and Albion have made to the season.
"I was born in Jamaica, but I grew up in Aston and I have been playing for Albion since I was eight," the defender said.
"It has always been my ambition to play for the first-team.
"I came back for pre-season and I tried not to expect too much.
"I was just determined to get back, train really hard and see where it took me.
"That's what I did and now I couldn't be happier.
"We've played well as a team, the lads have played well and we're picking up points.
"And the manager has been great with me, he is really good at working with young players and making them feel comfortable.
"He is really good at getting across exactly how he wants you to play. You have to be on it in every game and every training session. But he is a nice man."
Ferguson and Derby's Jason Knight are the only 18-year-olds to have made five Championship appearances this season.
But while most teenagers would feel pressure playing for a side chasing promotion, Ferguson takes it in his stride.
"I take things game by game, I don't focus on the pressure," he continued.
"When I am on the pitch, it feels like everything is locked away, everything is blocked out. I just play my game.
"Then away from the pitch I like to listen to music and I swim a lot. I think that helps because it's quite quiet, that helps me relax."