Yanbu at all. For me, right up to the night before my crazy family were being mental and bickering, to the point where our close friends and dh and me had gone to the pub for a meal, about 20 of us all in, and I ended up outside in tears on the phone to my sister as my step mum and mum had both been bitching to her about flowers or some such. I remember begging dh to call it all off and run away with me, and we had a really intimate family wedding! Weddings have a habit of bringing out little niggles and, after comparing notes with my best girlfriends, they had exactly the same thing; lying through their teeth to anyone who said oh, you must be so excited!
Even on the morning itself I wasn't excited, exactly. I was probably the most calm out of everyone! Even when the car didn't arrive and left me in my dress, my mum and my 8yo goddaughter standing in the carpark outside my mums house for half an hour! There was a lovely moment, though, when I got to the doors and the bridesmaids had gone, and me and my dad turned the corner and I saw dh. Poor thing, I was over half an hour late and my friends will have been mercilessly teasing him. He looked like there was no one in the room but me, and I think I realized then that it really didnt matter at all if my family were mad or the flowers were not perpendicular to the umbrella poles or whatever else shite they'd been banging on about. The important bit was the getting married to him, and the rest was just, well, trimmings, and dh and I, in the car afterwards, agreed we were just going to enjoy the day and let everyone else enjoy the fuss.
Oh, and I hate hate hate being centre of attention too. But actually it isn't like you think it will be. I was dreading it, but I found that any time there was attention to be at the centre of, dh and I were together (first dance, speeches etc) and so I could just squeeze his hand and focus on him, and I didn't really care if everyone was looking. And I didn't lose the weight I wanted either, which was plenty of fun on the morning as I'd bought my dream dress in a sale a size too small ha ha. I had to wear two pairs of spanx and it literally took three people to do the lacing up. My best friend ended up sticking her hand up inside the dress and shoving anything (fat) that wouldn't go into the boning into my cleavage, which ended up looking magnificent! You will be amazed at what can be squashed into a wedding dress; they are miracles of dress engineering and you will feel wonderful.
Nerves are funny things and sometimes manifest as stress, sometimes as shouty bridezilla behaviour, and sometimes just as a sort of numb-to-everything feeling. Focus on the important bit (you and him) and the rest is just fluff. And on the day, your guests will be just as interested in what everyone else is wearing and doing and saying as they are in you, it's much less pressure than you think, and if it is all too much and you and your new dh do a runner for an hour or so, everyone will think it's romantic anyway.
Good luck, I hope some of this helps. Everyone is different and you may well feel like what I've just said is nonsense... But just relax and try to remember, you're just telling him you love him, which you do all the time, you're just telling your friends and fam that you love him at the same time, then going to a party where everyone will buy you drinks and be nice to you, and you won't have to lift a finger all night :)
Have a lovely day and congrats!