Don't you worry. I don't even understand half Spanish speakers even being a native speaker. They have to make an effort to utter the standard pronunciation of their country/region for me to fully understand them.
Spanish has five vowels, maybe six. Spanish speakers use like 30.
Here, they use like 15 (the young man is trying to use a standard pronunciation)
https://www.youtube.com/watch?v=tpGoITAQJfQ