London, Apr 26 (IANS): \"Harry Potter\" star Rupert Grint, who initially had concerns about his acting abilities, admits now he\'s a confident actor.

"When you're working with people that have been classically and professionally trained, it makes you feel a bit... I don't know. I've definitely, I've gained confidence really, just the more you do," contactmusic.com quoted him as saying.

The 21-year-old star recently finished work on "Cherrybomb" - in which he plays a teenager caught in a whirlwind of sex, drink, drugs and crime - and admits it felt strange filming something so out of his "comfort bubble".

He added: "It was the first kind of real adult role for me really so I was quite nervous about it. It did feel like a massive step, as it's kind of away from home. We filmed it in Belfast, out of the whole comfort bubble of 'Harry Potter' really, as I've known everyone there for all my life. I had to speak with a different accent, so yeah everything felt different and it took me a while to adjust to that."