can't get vibrating anal plug in all the way

38m bought a vibrating butt plug/prostate massager and can't seem to get it in all the way. now it's not a size issue as I have 2 much larger dildos that fit fine and much more girth and length. This toy is much smaller in width and length. I always use lube. it's ok to laugh but I feel like I have short arms that don't quite reach like close enough to the anus region lol. (feel like a T-Rex with little arms) the base seems good enough to not go all the way just can't reach to fully insert. any tips or tricks?