Has my vibrator desensitized me?

I’m 25F and he’s 25M. I have been with my boyfriend nearly a year now and he's only been able to make me orgasm once and that's because I tried to do it myself to help him out but it takes FOREVER with my finger. I feel really bad that he can't get me there on his own with no vibrator involved he feels guilty and says he feels like a bad boyfriend and I always reassure him that he is a great boyfriend it's just how I am it’s been like it with my past bf's I was with one for 4 years and he only made me orgasm once! I remember when I was younger before I got a vibrator it was pretty easy to orgasm with just my finger. Now it doesn’t feel like much and takes a really long time for me. Even when I’m turned on I know I’m turned on but I used to feel tingling or some sort of sensation now I don’t feel anything now I’m a bit older?

Do you guys think it’s the vibrator that’s made me like this? I’ve been hearing it desensitizes you which is completely new information to me? I'm curious if anyone here is having the same issue as me. I’ve told my bf I’ve now quit using my vibrator and only he can try and make me orgasm now to see if it works. I don't really feel a whole lot during oral either he can be doing it a good 10 minutes and I'll just feel nothing... it's quite worrying because everytime l've achieved orgasm during sex is when I've used a vibrator with him and even then it’s difficult takes ages I hear that girls on here can get there just by penetration and that's crazy to me because penetration vs clitoral stimulation is completely different feeling to me.