Hebrew Verbs

Hebrew verb patterns are still very challenging to me. When speaking in Hebrew, you always have to remember the gender of the people you are talking with.

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As Dorit said, you can also say האנשים שאיתם אתה מדבר, it sounds a little more formal.

and you can say מאתגרים מאוד עבורי - it's not a mistake, maybe it's even a more accurate way to say it, just a bit formal for a small talk.

As you just said - you should pay attention to the gender, in this case אנשים is male plural