You can view minimum points for invitation rounds going back about 2 or 3 years on skillselect site.
We're all in the same boat, I'm also waiting for the points to drop by 5 so I can get an invite. Not everyone has 75 or 80 points. 70 points will probably the minimum requirement for an invite for most (depending on occupation).
Yes, the points were very high the last few months. We can't say what the minimum points will be for the next round, but one thing you can be sure of is that they'll certainly be lower than they were in the last few months - as points always reset in July. For my occupation, the points need to drop to 70 before I'll get an invite, and as they're currently on 75 they will most certainly drop again - if not now then in a month or 2 - refer to skillselect site.
No need to stress about it - sit back and wait. The points will come down again.