Victoria Beckham is 'constantly guilty' about juggling her children with her career but admits she has people that help her make sure her schedule revolves around them.The former Spice Girl turned fashion designer shares four children, Brooklyn, 14, Romeo, 10, Cruz, eight, and Harper, 21 months, with her husband David Beckham, and admits juggling motherhood with her busy career is a challenge.Speaking at London's Vogue Festival on Sunday (28.04.13), the 39-year-old star said: "I think you feel so torn, don't you? But I've got great people who handle my schedule and everything does revolve around the children."So, if there's a parents' night or an Easter bonnet parade or a nativity play, whatever it might be, then I plan everything around that so I can always be there."I'm a perfectionist, I like everything to be right. I'm probably a complete pain in the neck to work with because it is really important to me because I've grown this brand from nothing to where it is now."Victoria, who has a huge list of celebrity fans including Eva Longoria and Cameron Diaz, claims she was very unsure of herself when she first began designing clothes.According to the MailOnline website, she said: "I've always wanted to be involved in the fashion industry, I felt it in my tummy."At the beginning, there was a lot of raised eyebrows, or those that could raise their eyebrows. When I started, I did one-on-one presentations; I'd talk for hours to people who didn't even speak English."I think a lot of people probably thought, 'Shut up, stop going on about a bloody grosgrain waistband!'"