the concept that there has to have been a 'beginning', and the corollary implication that there will be an 'end!' (not quite as popular), are examples of the anthropomorphosizing of 'thought' itself.
The human animal is, and has always been, preoccupied with the concept of its own 'prime' importance - everything is about 'us' (i almost said 'them', not wishing to be associated with this myopic approach to infinity).
If one were to really think about it, the temporal continuum, where everything proceeds stoically on from never having started, to never going to stop, on a universal (or should i say 'Ultiversal', or 'Infiniversal') scale, makes far more sense; and is more in keeping with what one would expect/infer to be the case.
There only needs to have been a beginning, if there were a 'plan' leading to 'us', the pinnacle of evolution (yeah, right!

).
[and now that 'we' have been reached/happened, there is (surely) no need to go on
- the price of perfection!

]