so do you think the universe is the size that its just because thats the size that it is? No knowable reason, just take it as it is.
The universe is expanding. It has varied in size over an incomprehensible number of orders of magnitude over the last 13.7 billion years, and the majority of the universe appears to be inhospitable to life.
There may be a reason that we did not arrive in the universe until it was at something like its current size, but the idea that the universe is fine tuned for size does not seem supportable.