I don’t feel lonely because I grew up as a loner so I’m used to being lonely and every time I’m about to get bored, my mind goes into think mode so I’m almost never bored so it might be hard for me to relate on the lonely part 
Um, wow, what I can say is to do activities that you enjoy. Surround yourself in stuff that you love. PM people who are willing to PM you in order to bring your mood up. Look at funny gifs, hand write a story, the possibilities are endless!
I have a thread here that u can check out: List of Ways You Can Distract Yourself 