hello there :3
im not the best person at shielding and protection but heres a method i found once while strolling on the internet, ill copy paste it from another discussion i posted it on, hope you find it helpful!
well theres this very basic method that i learned a long time ago which seemed to work very effectively, i even taught it to my friend who suffered from the same thing as you (he didnt know empathy even existed) and it worked just fine for him.
close your eyes and imagine a ball of white light coming out of your head, then slowly make it move around your body, after you're done make it expand and shield you.
this might not seem practical as it needs time and concentration but by time you'll learn to do this without imagining the whole process to shield yourself when needed, also dont think about it too much as it can exhaust you.
I put much info into this blog post....