At what age can a minor work and receive pay in England?

Hi. I'm Ana. Im 14 years old, and I'm Portuguese. Im living in England, and i would like to get a job.
I don't know if it's possible. All the answers i get is "go work to neighbors, walk with dogs, wash cars" and stuff like that.

The problem is that I'm a little shy, and i can't just walk into others house asking if they want me to do any of that stuff!

One thing that i would do is baby sit. Im good with children.
Please, if you know anyone in Newbury that can give me a job, please say to me!

Thank you, Ana.