How Do I fix This Please?

I'm only new to windows 10 but I am worried about what I see here. I do not own a mobile phone that is connected to Virgin for a start. I also seem to get other funny connections that are not mine similar to the Virgin Mobile one you can see below on the image.



Funny thing is when I click on my internet connection icon that looks a bit like a hand fan or slice of cake :)
and I click on the name - say the virgin mobile one in the image above and I untick the box that says "connect automatically". I go from having three bars on my internet connection icon to four like it shows on the below image.



Is this because some one else is using my internet connection or not please? For some reason when I only have three or two bars lit up on my internet connection icon my internet slows down.

My last question is IF other people are using my internet connection how do I put a stop to this please?
I have repassworded by router. I have had a look through the wi fi settings but cannot seem to be able to fix the problem I am experiencing above.

Any help would be greatly appreciated. Although I am NOT computer illiterate I am only new to windows ten and have never came across this sort of thing before so it is strange to me. My internet provider said it was nothing to worry about but I am not so sure.

Thanks every one. :)

Thanks dalchina I have done all that but I still seem to be getting what I have stated above in my first post! I have no idea why.

If there are other routers that may be near by or at a different residence your WIFI adapter will pick up the WIFI SSIDs from those routers.

Ok to your router. What is the name of the SSID for your router? You say the virgin mobile is not your router.

Do you have your router set to automatically broadcast your SSID within your home? Some routers do not have that on by default, which means you would have to manually go into Windows network settings and manually set up the SSID, security key, etc.

I wonder if your router isn't broadcasting correctly