Gail Rudnick and Kim Murstein — the no-nonsense hosts of hit podcast series “ Excuse My Grandma ” —  are The Post’s  brand-new advice columnists . From family feuds to friendship fallouts, money, marriage and sex, there’s no topic too taboo to tackle, and the native New Yorkers will hash out each issue from their differing perspectives to tell the tough-love truth — and you’ll thank them for it. To get your questions answered, head to  nypost.com/ema  and drop them a note about what you need sorted. Tamara Beckwith Dear Excuse My Advice, My friends are losing weight on GLP ones and boutique workouts I can’t afford, and the comparison is starting to mess with my head. How do I deal with this? Grandma Gail: Don’t feel bad. Don’t compare yourself to your friends, for heaven’s sakes. You know, just wait. Wait a little bit. You’re going to get a pill for, like, $10. It’s going to do the same thing. Kim: No! The advice should not be to also go on the GLP-1!…