I've tried to start Kegel exercises, and I am having some trouble isolating them aside from contracting my rectal muscles. Any suggestions?
Does this mean that by contracting the rectal muscles, itll will still tighten vaginal muscles?

try it lying down first with your knees bent it seems a little easier at first

Next time you're peeing, stop your urine mid-stream. The muscles you use to do that are what you should be exercising.

Do not make a habit of stopping your pee mid-stream, it can lead to a bladder infection, but its fine to help you isolate the muscles.

l do these exercise and it does take some time to separate the two. Practice leads to perfection. It will still work for the vagina, so don`t worry.

Oh you need to contract your rectal muscles as well! Otherwise you will be tight in front and loose on the posterior wall. Try to isolate the front muscles the way described here but do not leave your rear muscles out.