Here's a simple test that you can do it yourself easily.
Go to in front of a mirror, be that in bathroom or elsewhere.
Start by smiling at yourself in the mirror.
If you feel like looking away from yourself in the mirror when smiling, then you don't love yourself.
Start by sending love energy to yourself in mirror.
If you feel like looking away from mirror (or from yourself) when being loved, then you don't love yourself.
Keep doing this test many times till you are not ashamed of this simple act anymore, and you are then ready to go out in the world and love everyone.