Somehow, although born at the same time, you're the "middle" child. Or, maybe it's a similar dynamic with triplets that has another name that I am totally ignorant of. This is not the worst thing that can happen. While it hurts and feels slighting while you're still adolescent, it passes. You gain understanding over time.

The truth is, they are a bit less excited - or rather harder to excite - over your relationships because this is old hat for you. You have, literally, years of experience in this topic that your sisters don't.

When you first started dating, it was new for them, so they weren't ready so fawn over it with the same excitement. Its scary at first, for them. Its part of the gig learning to raise daughters. Believe it or not, parents don't actually become experts in child rearing when kids are born. It takes decades, and even then they constantly screw it up. This increases exponentially when you have three at once!!!! Its hard enough to havs 1 of either sex, but I don't envy 3 girls at once. That's more emotional charging than I'm equipped to deal with. Your parents are beasts in my world.

Anyway, learn to forgive them. I promise they are trying their best and I promise they don't realize they're slighting you. They don't have time to be that calculated, they have three daughters the same age. They're sprinting to keep up 90% of the time.

Because you've demonstrated a level of maturity with dating before your sisters, you get treated as such.

Use your words. Tell them you would appreciate more consideration of your relationship. You understand sisters just started dating so it seems more exciting, but you would like them to also show interest in your relationship.

And they'll feel guilty and awful, because it will be news to them, but that forgiveness goes a long way.