Congratulations on making a start and on your loss so far.
The exercise will get easier the more you do but don't overdo it either in the early stages. If you're doing full on gym sessions maybe a lighter day in between will make it easier for your body to recouperate. Perhaps go for a walk on those days or similar.
And just in weight loss in general .. I say this to any younger person who will listen
. Do it NOW
. Stick with it and you will be doing yourself the biggest favour. You don't want to get to 40 and wonder what could have been.