Am I the only person who feels drained in social events, like weddings, parties etc.?

Of course not.
I despise formal parts, dancing and when music is too loud.
Food and interesting conversations with strangers are fine though.

Right there with you. Fortunately (and in some ways unfortunately) I don't actually get invites to any.
The joys of being an introvert!

Sometimes even one on one with friends.

Introverts unite!

No, of course not! You're probably an introvert. 👍

You're not
And some events based on family or old friends can be with so much pressure sometimes that the fun can't go over this

Good book and well worth the read if you are a fellow "loner":

"Party of One -- The Loners' Manifesto" by Anneli Rufus.

Available on Amazon.

No, I feel it too. After spending a lot of time being social I need a full day or so to recover.

I’m like that but I’m trying to become more social. It’s unnatural though

It's something that I will do, because otherwise I'd never go anywhere! But yes, it feels stressful at times.

It’s part of being an introvert, you need time to yourself to recharge.

You are not the only introvert on this planet XD

same here 😐 I'm mostly there for the food

nope not the only one. I hate going to events like that. I am really anti social and just dont like people in general.
I have a small group of friends and family i enjoy being around and every so on i meet someone i like the company of, but other than that i avoid stuff like you mentioned as best as i can.
Just talking on a phone makes me feel drained

Absolutely not. But personally I have that issue only when I'm sober 😶

Felt 🙌🏻

I never do. But I don't like entertaining for too long so I think I'm a little bit introverted.

I wouldnt know i dont go to them

nope. that's pretty normal.

You are not alone!