No, even with zero intervention, not everybody gets a new virus. I think the figure is something like 60-80% of the population.
And these 60-80% are not going to all get it right now. But if you don't get it now, then chances are that you will get it in a couple of months, or in half a year, or next winter. The chances that you will not get it at all are perhaps one in three or one in four.
The good news is that if you are one of the two in three or three in four who do get it (at some point), then the chances are hugely in your favour that it will be a mild disease.
If you do catch it, but manage to delay catching it until the worst crisis (pressure on NHS) is over, then even if you are one of the unlucky ones who need hospital care, chances are overwhelmingly in your favour that you will be treated adequately and get better.
The worst odds would probably be if you catch it in the next week or four, and end up being the one-in-six (or so) of those who catch it, who require hospital treatment and ventilation, sometime in April; then if you are older and/or particularly vulnerable, you might not be given the care you need (because the resources would be prioritized for younger/healthier people), which would drastically reduce your survival chances.
So the likelihood is that you will get it at some point - most people will, but not all.
But there are very, very good reasons to try to avoid getting it right now/in the next month. Any precautions you take now help you, and help slow the spread overall so help everybody else as well.