Express it? I can't

Not showing it doesn't mean I'm not concern.
Not talking about it doesn't mean I don't care.
I'm just someone who doesn't express myself as much as how you've expected.
But I would want you to have faith in me,
that I actually care.
Even if I act as if I don't know, don't care,
deep inside I actually take note of every move and reaction you make.
Looking at these and my sensitive self would start trying to make you feel better.
I just want to give people a sense of assurance and security.
It's not that I'm a boring person,
it's not that I'm always keeping quiet.
And it's not that I'm not opening myself up to other people.
I am just being careful with my words.
I don't know if my words would hurt,
or would they cause any discomfort.
I'm just afraid that I'll offend people.
I'm like this because
because,
I just want people to feel at ease when they're with me.
And also because,
I believe that silence it's the best way to give comfort.
Saying nothing and just being by their side,
sometimes it's the best medicine.
Especially in times when things really turn out bad and people don't want to talk about it.
I just want to be like that.
Always there without a sound and listening,
but at the same time cannot express herself well enough,
that's me.