How many pushups can the average woman do?

I've been working out for like a week (I know, not very long lol) and trying to tone up but I've been wondering exactly how many pushups the average woman can do? I mean real pushups as well not the ones on the knee. I'm 5'2" and weigh about 150 lbs and I can only do about 6 pushups. Should I feel bad about this? Or is it pretty normal? I told my sister and she acted like it was really bad and I guess it put me down a little. I mean, I weigh a lot so I feel like it not that bad but I don't know.
How many pushups can the average woman do?
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