John Travolta says career lows don't bother him.

The 'Pulp Fiction' actor - whose Hollywood career has spanned four decades - has revealed he doesn't worry about suffering lulls in his acting career because he feels incredibly blessed to still be working in films.

He explained to The Guardian newspaper: ''You have to understand my origins. I'm from a working class family; we didn't have a lot, but we had the arts. You're talking to a guy who makes a living at doing what he loves doing - acting, singing and dancing. So any career ups and downs were not that significant to me.''

While he isn't bothered by dips in his career, the 59-year-old star admits the ''losses'' he's suffered in his life - including the tragic death of his son Jett at the age of just 16, and the recent loss of good friend James Gandolfini - weigh heavy on his heart.

He said: ''The only things that really powerfully impinged on me were my losses and there were many in my life. Those had an impact, but short of that, movies - I love them, but they're not life.''

The 'Killing Season' actor and his wife Kelly Preston, 50, mourned the loss of their eldest son Jett in 2009 when the teenager - who had autism and suffered from seizures - succumbed to a deadly seizure.

Elsewhere, John - who also has daughter, Ella Bleu, 13, and two-year-old son Benjamin with Kelly - heralded his friendship with late 'Sopranos' star James as being a ''true connection''.

The actor previously revealed his close pal, who died of a heart attack last month aged 51, consoled him after Jett's death and ''would not leave the city until I was OK''.