Is it really infinite ?..really ?

As far as I understand ......... at the beginning the entire universe was compressed into a teensy weensy yellow polka dot bikini of a state.....and then......from nothing.......expanded like a balloon.

Is this not the generally accepted understanding ?

In this context, what is meant by infinity?

If you are on the inside of a black hole, then you can ask, if you were travelling at the speed of light, how long would it take you to reach the event horizon of the black hole, and the answer is that it would be an infinite time to reach the event horizon, and so one might say that from insode the black hole the event horizon is an infinite distance away. Yet, looking at the black hole from the outside, the event horizon has a finite size. So, does not infinity depend upon one's perspective?

The Big Bang may have been teensy weensy on the outside, but what was it on the inside (after all, on the insode, there was an awful lot of mass that would have been distorting the space around it)?