How to stop pulling out eyelashes?

I've been doing it since like third grade and now I'm 15 and I have had times where I stop doing it for a long time and I think I've broken the habit but then I start again. When I'm not pulling it out I feel stupid for pulling eyelashes out and I tell myself I'm never going to do it again, but then I end up doing it anyways. Sometimes I don't notice I'm doing it until after I pull it out, other times I totally aware that I'm doing it but I don't care. My eyelashes aren't as thick and long as they used to be and I'm worried they might not grow completely back even if I stop. I know I sometimes do it when I'm stressed but I've tried everything to stop but nothing helps.