Dildo doesn’t feel the same

I’m a virgin but I’ve been using a 6 inch dildo for a couple of months now. At first it hurt a lot naturally since I’ve only ever had a tampon up there. And now it only stings a bit when I start and then I’m okay after that. But, when I first started using it after when it was really painful to use, it felt so good. I dont know if it’s because I wasn’t stretched so it hurt a little but enough for me to feel pleasure. Now when I use it, there’s an initial pain but after I don’t really feel pleasure. It just feels normal, like nothing. I was wondering why? Is it because I’m used to the size now? Should I get a bigger dildo?

Thank you for the help.