M30 F25 - Is my relationship ending or due to evolve?

Hello, i’m 25F & dating 30M. We’ve been together around 6 months and today we had a big discussion that has caused some anxiety. For context, we have some differences at first that were overlooked and now are starting to show. Mostly that he is extremely social and has lots of friends, in lots of groups etc. he just knows everyone. He doesn’t struggle with confidence or ‘what to say’ and just seems to flow naturally. And then there’s me, I’m a bit more shy with people I don’t know and I’m sure you can imagine i have had to meet a lot of new people. He has a main friendship group mix of guys & girls (some couples too). When we all hang out I find it hard to know what to say, how to interject conversation and I really try my hardest. It’s like I get tongue tied. He has noticed and has mentioned that because he cares about me he spends this time together worrying if i’m okay rather than enjoying himself with his friends. I hate this :( I just wish i had the skills to just jump in and be super chatty and confident. I don’t really drink and have a large social circle around me i have around 2 good friends. My life is basically my hobbies, work & gym. It kind of makes me feel embarrassed- he is so well experienced, he’s been in the army, he’s travelled, he just does life so effortlessly. He is also emotionally mature in a much simpler way than me, i can talk the talk but can’t always walk the walk. On friday we were supposed to be having a date i had planned, i had booked us bottemless brunch like cocktails and food. I thought he’d like it, every time we have been out with friends he has drunk. this evening he didn’t feel like it, i got really embarrassed and shut down and we didn’t end up going even though he still asked to see me.

He is living with his sister & at first, i was there a lot of the time. But then her husband began to neglect time with her preferring spending it with my partner, and she hinted at not wanting my partner there on certain occasions (guests round etc). he is quite loud. i’m aware of this dynamic and have been spending less time there because of this, so i didn’t want to stay at her place the night we had date plans as i’m conscious of her feelings.

The rest of the weekend he needed time to think- he shred that he weighs up if we are compatible, he says he loves me and wishes i could be my true self around his friends, he wishes i would reach out to the girls in the group and ask them out for coffee etc. i’m conscious that on their days off work etc they won’t want to spend time with me because they already have established friendship groups? but he said he doesn’t want to break up, he just wants things to change and evolve.

am i a complete mess? i feel like i don’t function like a normal person, i care about him very deeply. in certain situations like when plans change, i can really go in on myself and want to cancel the whole thing.