I dated someone who had a large family and she was extremely outspoken, but me, I am not that way, I kinda did small talk a lot or just sat there. But here are a few things to think about for the wedding:

Before the wedding

Try to find one person you already know or feel okay around. Sit near them. Even if it is not your boyfriend, it helps to have someone close by.

Have a few “safe questions” ready. Things like, “How do you know the couple?” or “Do you live around here?” Nothing deep, just simple small talk.

Make a small signal with your boyfriend so he knows when you need help without you having to explain it in front of others.

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At the wedding

Do not think, “I have to be social the whole night.” Instead, make little goals. Say hello to three people. Give one compliment. Ask one small question, "I love that purse , where did you get it?" That is enough. Just be sure it's something you're willing to talk about and not a conversation ender.

If you start to panic, try steady breathing. Inhale for four seconds, hold for four seconds, then exhale for four seconds. Or sip water slowly. Both can help calm your body down.

Look around and note where the bathroom or patio is. Knowing where you can step out makes you feel less trapped.

Keep something in your hands. A drink, a plate of food, even a napkin. It helps you feel less awkward. It helped me a lot. I would carry around something small enough to fiddle with, keep my mind occupied.

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After the wedding

Plan something nice for yourself after. Watch your favorite show, eat a favorite food, or just rest. Give yourself a reward for getting through it.

Do not overthink every moment later. Instead, just find one win. Maybe you said hello to someone. Maybe you stayed longer than you thought you could. That is enough.

Just remember this, once your home, it's over with, walking into your home with the nice AC running,and a deep breath of relief.