My problems keep ruining my relationships

I have been with my current boyfriend for about 7 months now, and I feel like im making the same mistakes I did in my previous relationship but I don't realize until it's already done.

I have a lot of anxiety and mild depression that I'm still recovering from due to my last relationship (It was very toxic and I was isolated from any support for 2 years). My anxiety made everything worse in my previous and I feel like it's doing the same now. It's like I'm too much for people to handle so they get frustrated and leave. My boyfriend is the sweetest most understanding person in the world but he has voiced to me that I can be a bit much for him at times and it hurts. He also tends to get quiet and not know what to say when something is really bothering me like my health anxiety and it makes me feel like a burden and I'm annoying so I end up distancing myself.

Recently though we had gone to his sisters birthday party and I was meeting everyone there for the first time and I was very nervous. I'm also a pretty shy reserved person so this was a big thing for me. I didn't talk much as making conversation and small talk is hard for me. I participated in games and tried to enjoy myself as much as I could but I ended up developing a pretty nasty migraine and wanted to leave early. My boyfriend was a little disappointed and wanted to stay but still left with me and I felt bad for ruining his time. He insisted it was fine. The next morning he told me that it did bother him that we left and that he was worried if be unable to participate and relax in group settings with new people and said he was concerned about the future. It hurt me and I explained my side he understood and apologized so we're fine now. However it's still bothering me because I feel like I completely ruined his night and now there's a pressure on me to perform and be social or else he'll be disappointed and question being with me, or maybe even break up with me.

I just want to know how I can stop letting all of my issues get in the way of everything but it's hard. I have severe anxiety and chronic migraines so it seems like no matter what I'll always be uncomfortable and ruining things for him.

A bit of word vomit but I just wanted to get it off my chest