Picked up my first prescription 4 hours ago, haven’t been able to jab myself…

Got my first prescription today.

I picked it up about four hours ago and I got home ate something small and I went to inject it and I couldn’t.

Not afraid of needles, but my body will not push this thing into my stomach no matter how bad my brain says to do it.

I will continue trying but anyone who’s dealt with this have any tricks up their sleeve?