Firstly, and most obviously, never feel that you should do something you're not comfortable with just to please your boyfriend. Unless you're comfortable you won't enjoy it, and so unless you're boyfriend's a complete idiot he won't be pleased anyway.
However, it seems strange that you should decide that you're not into 'all that' when you have never tried any of it, even on your own. I don't know what kind of stuff your boyfriend's bought, it could range from something as simple as a tiny vibrating bean to something downright kinky. Obviously you're not necessarily going to be into a lot of it, but I'd recommend keeping an open mind just in case you do find something you like.
Warn him in advance that you are willing to see what you're comfortable with but are extremely apprehensive. Take a look at the stuff he's bought and see if there's anything that doesn't terrify you, and maybe give it a go first and see how it works. Make sure you're the one in control of what you use, not him. If it's all really hardcore and scary then fair enough, at least you've given it a chance.
But whatever you do, don't feel obliged to have a 12 inch long vibrating piece of rubber in bed with you - it's about what does it for you.