I seriously hope this has been a huge joke, but on the off chance that is has not:
A vowel sound is one made via the relatively free passage of breath through the larynx and oral cavity, with the vocal tract open. If you have to close the vocal tract (even partially) in order to make the sound, it is not a vowel sound, but rather a consonant sound. In English, there are 5.5 vowels: a, e, i, o, u, and (depending on how it is used, thus this is often referred to as a "semi-vowel" in phonetics) y. Note that w is not among them (because you have to close your mouth, at least partially in order to make a "wah," "weh," "wee," etc., sound).
Thank you, that is all for right now.