let me guess, you are under 18 (barrier one) and therefore you must be with an "experienced adult" who, in my case, is less experienced than me
barrier two would be something like "no lead climbing if you are under 18 without staff present" which i have experienced. goddammit, why don't they encourage young climbers?
(barriers three and four are for me, money and travel. but that's my fault not theirs.)
to overcome barrier one, pretend you are down the pub and lie. get a fake id. this would also handily overcome barrier two.
alternatively, sod it all and go outdoors, much more fun. i'd rather try and find dry rock outdoors and not find any than go indoors.