I wrote a series of stories involving people at OtakuBoards, which everyone seemed to really like. But people kept asking me to be put in and since I didn't know them personally, it was hard for me to do anything more than give them a line of dialogue or action because otherwise I ran the risk of making them do something out of their own character. It's hard to always predict what people want, and with art it's much easier for people to criticize when they shouldn't be, and that includes self-criticism.
Seriously, if you want to continue, do. If you don't, then you shouldn't feel pressured to. It's up to you. But if you berate yourself for trying you'll only feel worse about it, and any efforts you do make to improve will always be marred by your own doubt, which is never very productive.
Take a break and see how you feel, heh.