Basic Understanding and beyond infinty

What do we basically understand by the term infinity? We use infinity as a term which cannot be expressed. But what if it meant something else? Mostly if its either physics or mathematics(pardon me if i'm wrong) but we use infinity at a place where we know we cannot take it further or where something goes wrong but there is no point of return. It can also mean that you just added the infinity because you know it is wrong but you still got to do it for the proof. So, everyone's perspective varies but what if infinity is something which is not real? What if the term "infinity" is actually non-existent? Well as we all know infinity is something which cannot be expressed so basically it is something which we cannot express in numbers... Or can we? Infinity is something which goes on and on and on forever! We can keep writing 99999......... to the power of 999..... but it will be a term which can still be expressed! You can write a number so big that it covers the face of the earth or something which can cover the whole universe. If you see it in relative terms the solar system is a very big place but when we compare it to a galaxy it is small but getting back to the solar system here you can just imagine that and we all know that the length and width of our solar system has been established by various telescopes,astronomer,etc. But when we compare it to galaxies as well we can find their system. So far i think the largest number would be something around some zillions or something but we can never stop at this because numbers can exist to an extent of the human brain mechanism. The numbers if i wanted i could just write countless numbers but it will still be a number which can be quantified. We could just write numbers as big as the universe( ie when we get to know about how big it is and until we totally discover it) because finding out the total extent of the universe i say would take around more that 6-7 centuries of technological advancements which would atleast first lead us to matching the speed of light, then it would be to the first man made journey till the kuiper belt, then to the find out the  extent of the Milky Way galaxy by a human, discovering more about black holes, sending probes around them or into them, then sending a manned mission to just finding the extents of the universe, the randomness around you, the things you discover and also maybe find aliens. Who knows when this will happen? But this can only be accomplished until and unless man cures himself and the surroundings near them and then getting rid of all the chaos around them and finally cleansing themselves so that they don't tear themselves apart by the hands of war.
"Man is as vulnerable as anyone  could ever be but a group of men to defy this will be the ones who will the first to find the inner depths of himself and the world around him! In this mass randomness there is soo much to be explored but all he thinks is that they are the ever correct and the only ones."
Let me know about your views in the comments!