I am no good at drawing but I do it anyway, it doesn't have to be anything fancy, sometimes I just draw all sorts of colors. You could get some pastels and blend them, it makes it really pretty and blending them is really therapeutic.

However art takes many forms. It could even be collecting something, like leaves and ripping them up and gluing them on a poster board to make a prety collage of different colors and types of leaves, or even an instrument, Piano always helped me. Also writing, I find poetry and writing a third person narrative always helpful. Like I'll take my emotions and put them into a character in a situation and write it out.

I think your T used the term 'frivolous' wrong, she/he shouldn't have said that. To me that connotates useless, and something that helps you isn't useless. These aren't frivolous at all