Is it too late for me to join this challenge?

I am 40kg heavier than when I met DP, was already 30kg overweight when i got pregnant with DS.

I have joined a gym which has free personal training and have been a few times so far. Going to build myself up to going every second day and every other day just going there to do cardio or going for a walk with Cooper (DS)

My biggest struggle is junk food.... it tastes so good and seems to be sooo much more convenient... wat takes less time.... opening a bag of chips or making a salad.

I really need alot of support... I want to be thinner... I want to be able to run around after Cooper.