Hi. I promised to make some artwork for two friends. I'm not getting paid or anything, I just wanted to do it to show appreciation for all the help and generosity they've shown me. We have talked about it quite a lot and they are very excited for it.

The thing is, I cannot do it right now. I'm too depressed. I can barely take care of myself or my own home. Being creative and doing major artwork is way too much to ask of myself right now.  I want to do it but I don't have the energy nor the mental capacity. I press myself to start painting but I just can't, sometimes I break down crying.

They have started to press me a little on it. For one of them I promised to do it a while ago and the other one is for an album cover, so time is starting to become an issue. The last time I spoke to one of them he asked me when he is going to get the art and I told him I couldn't afford the paint rn, which was true at the time. He knows I have the money now. 

I will meet them very soon and I don't know how to explain to them that I'm just too depressed to do it. I'm afraid they will think I'm lazy and that I'm untrustworthy since I can't keep my promise. Any tips on how to explain to them?