V and W are two different mouth shapes in English. Many languages have only one sound in that space, so very becomes wery or berry, and west becomes vest.
For V, rest your top teeth on your lower lip and buzz. For W, round your lips like a kiss with no teeth touching, then open into the vowel.
21% of 11,507 scored /v/ sounds in the SayWhat app were scored red, from at least 3,865 learners.