The Love of Students

How do you yell at someone that you love? I do it to my son all the time, but somehow that feels more natural. But when I yell at my students I worry that they don't know that I love them. My son knows, my son is a child and knows a parent's love completely and without doubt. But an adult doesn't love like a child loves, and they confuse anger and yelling for a lack of love. I love my son unconditionally so when I yell at him I'm never filled with doubt. I know it isn't my ego involved, but just a genuine and pure love. But when I yell at my students my heart doesn't feel so free. I worry that it's my ego and not my pure heart that's directing me. But I love my students, and I need to see them grow, so I yell at them and correct them and I worry that they don't know that I love them.