Is it normal to feel really awkward around my boyfriend's family?

Some context before I begin, he was with his last girlfriend for about 5 years and I gathered from Facebook investigation (don't judge me) that his mother quite liked her, they went to the same church, the mom ran her youth group etc. We are also both 20 year old college students and still live with our parents.

He started pestering me to meet them after 6 months, telling me his mom was unsure about me after seeing large love bites I put on his neck. The first meeting wasn't too bad, just very tense. I went to his house for dinner and it started silent, then they started asking really painfully forced questions about my journey there, whether I had siblings etc with really long heavy pauses after every response I gave. There was only one comment on the biting though.

It got much worse after the second visit. It was my boyfriend's birthday and he invited me over to his house to have pizza with his family, or so I thought. I get there and realise his ex girlfriend's family are also there, and his mom is best friends with her mom. They were all talking endlessly amongst each other whilst I sat there, ignored for most of the night, feeling like the elephant in the room. So I started drinking wine to pass the time. Lots of wine. So much wine I woke up the next day in my boyfriend's bedroom with him asleep on the sofa downstairs. Apparently I fell asleep on him whilst "we" were all talking in the lounge.

Both these meetings happened in January and he's been pestering me to see them again but in all honesty I don't want to. I feel like I make faux passes every time I see them and I'm just flat out not wanted. I'm the socially awkward, bite-leaving, drunken, reminder that his relationship with Little Miss Perfect bit the dust.

So people of IIN, am I over-reacting? Did any of you have issues with your partner's family? Any (serious) comments and/or advice will be very much appreciated.