Psychic shields and magic circles in weird energy shapes?

The magic circle illustration from Francis Bar...
(Photo credit: Wikipedia)

I took a long break off magic, like a ten year break due to having kids, and a mountain of other RL issues. So now I’m slowly getting back into magic, studying it and refreshing myself from the beginning. At the moment, I am working on grounding, centering, and shielding. I do a daily mediation to do this. But my psychic shield never looks like a bubble. It looks like a human shaped balloon. Sort the energy taking on my shape and not venturing too far from my body. So I keep imagine that I’m in the middle of a human shaped balloon or something.

And that’s not the only thing. So magick circles, I do the visualization and I can’t get my energy to do a bubble at all! I mean it’s a weird oval shape or something. It’s weird. I have no idea what it’s going on. Any suggestions? am I worried for nothing?