I have a lot of trouble with knowing how I feel as well, and I've been told that it's not unusual. For a long time I actually didn't feel anything. I was (and still most of the time am) just empty. Since starting with therapy (earlier this year) my emotions have started bubbling up in quick intense jolts. Right know I'm trying to work on figuring out what emotion I am actually feeling when the jolts come. Journaling does help. Even when I don't know what emotion I am feeling, I write about the things I can pinpoint: intensity, duration, what I was thinking about before, physical sensations, etc. Is your journal only to write about emotions? If it is then perhaps try what I mentioned. Either way, good luck with writing, and you are not alone.