Inner introvert's rant

I realised recently that I'm a real 縮頭烏龜 (for lack of a better word, pussy).

My job is to promote the group and their events and get people interested. But recently I feel like I have not been doing that at all. I dislike talking to random strangers, in fear of rejection, or that they will look at me as if I was one of those desperate beggars in China. Sitting stall has become tedious. Not just because it feels like a bit of a chore and with increasing time, my enthusiasm for the events decreases. But also because I'm not really fulfilling my role as PR. I pretty much stand at the stall, not really appealing to the students that walk by, because I don't know HOW. I constantly reject the other execs' requests of going up to random people, asking if they would be interested in our event, which gets me a reply of "you're PR, why aren't you doing you're job?" I even got a "how did you even get this job?" to which I replied "I don't know..." The committee does a better job of bringing people in than I do, and I feel ashamed. It may just be the event itself that's a little difficult to promote, but I cannot blame that entirely. Have I exhausted my energy and passion for this club? Am I just a terrible persuasive speaker? Most likely a bit of both. Either way, not doing a good job discourages me from wanting to promote because it leads me to think that I will continue to not do a good job. Feels like a bit like a vicious cycle.
The clear solution here would be to just pluck up the courage to walk up to strangers and talk to them. But it's not something that comes easy to an introvert like me. Add to that the fact I care quite a lot about what people think of me. Not a great combination for a PR is it? All I know is that I need to fix the problem and I need to fix it soon.

(and tbh, I'm not doing much in terms of helping the group either, so that just makes me feel worse...)
/end rant of self pity