Vibrator?

So im 15, and I recently asked my mom for a vibrator. I feel like it would be better for me then having actual sex for the obvious reason of pregnancy but also my anxiety. So i think im going to get one. I have the priciness. Anyways, so my pussy is tight. Like really tight. I struggle to get tampons in and even one finger. I feel like there’s a tension. Any tips? Ive tried relaxing completely but i just cant. I also dont have access to lube