The letter and the sound U are very different and not natural to say by an English Speaker, because this sound does not exist. However to avoid confusion between words it is necessary to learn it.
How to put your lips and your tongue to get a pronunciation like a native.
Pascal teaches you the best technics to speak like a French native.
It is very different from the English U and depending of the other letters of the word, the pronunciation can change.
1. Try first with the letter E and without moving your tongue, put your lips like the video.
2. Pronunciation of A + U
3. Pronunciation of E + U
4. Pronunciation of O + U