The leaves on my lemon tree are yellow and white, and the fruit doesn't look normal.
This plant is variegated and is likely to be Citrus limon 'Eureka Variegated Pink'.
Described by the New York Times as
A mutant found on an ordinary Eureka lemon tree in Burbank, Calif., around 1930, its immature fruit has green and white stripes; the older fruit loses the stripes and develops flesh pigmented pink from lycopene, which also colors pink grapefruit. The trees are usually poor producers, perhaps because their variegated leaves are low in chlorophyll.
So there is nothing wrong with your lemon tree. It is a unique curiosity.