Sometimes homogenized milk won't work as well to make cheese. I don't know why. What kind of cheese are you trying to make? I have a cow and am not real good at making cheese yet. But I did just make a wonderful mozzarella! Queso blanco is a fabulous cheese and so easy for first timers. You only need vinegar, salt and milk. Google for a recipe. Don't give up. What recipe were you using? Here is a site below. It is good and they have very good directions. you may need to warm your milk a little, like to 90' depending on what kind of cheese you are making.

Here is a link that might be useful: Fias co farms cheese making site