I haven’t used calm in a long time but my favourite ones to start were the body scans because they’re so simple. I used to set the timer to something really short like 3-4 minutes to start and I did them on my break in work in a call centre job.
Sometimes it helped, and sometimes it was frustrating, but it acted like a temperature check on my emotions. If it was frustrating I knew I was more sleep deprived or stressed so it let me know I needed some more self care, like an early night or some time to myself.
I’d like to echo another commenter’s advice of looking into therapy if you can afford it. At the same time as I was getting into meditation I also got CBT therapy from a fantastic therapist and it was one of the best things I ever did. If you have any questions about it feel free to ask.
Best of luck OP 💕