Being ignored by friends

Does anybody else feel completely ignored by their friends? I have certain friends that never reach out to me first, it will always be me who has to start the conversations. Whilst I do understand that the majority of people I speak to are neurotypical and have busy work lives I feel that if they truly wanted to be my friend they would try and connect? One friend in particular tends to very rarely post on social media or message people so I tend to try sending messages when they've recently posted things as I know they'll be on their phone, but it can go days or even weeks before I'll even get a response. 
It breaks my heart because it takes two minutes to check in with someone and say hi or to let them know you can't talk right now, and this friend is someone I have known for at least 8 years and they were my best friend in high school. Now I have an odd thing with relationships, I know I can be overwhelming and honestly I feel entitled to be responded to but I've worked on that and rarely message them anymore. I don't push people to respond to me but I really really struggle internally when they don't. 
I don't work myself due to extreme social phobia and mutism, so I think it's hard for me to understand their point of view about being busy. Do I give up on the friendship? Do I try and salvage it? I think it's worth noting that I have told them multiple times how I feel about them not responding and they've apologised and said they will try and be better with it but then there is just no change?

Parents
  • People work for 8 hours, come home and do chores, cook, clean, and maybe even raise their own family, and they might not have much time for even themselves. When people are drained, it's hard to put in more effort to do anything more on top of that. People also need personal space too,  which is healthy for them. 

Reply
  • People work for 8 hours, come home and do chores, cook, clean, and maybe even raise their own family, and they might not have much time for even themselves. When people are drained, it's hard to put in more effort to do anything more on top of that. People also need personal space too,  which is healthy for them. 

Children
  • You know talking of work I seem to be the only one in my work that wont socialise with work friends outside of work dont get me wrong they are my friends but in the same breath I dont mix work with my time 

    The only way I'd go see work friends in my time is if I was invited to a dungeons and dragons one shot game by them Haha but that's because then we are not work friends we are heroes of the sword coast battling beholder and avoiding the grasps of a gelatinous cube 

  • I understand that, but to be ignored for weeks is painful. I maybe neglected to say that they do sometimes post statuses and pictures during these times and it stings that they're on social media and just choose to not speak to me. I know people are busy with work and life but I ALWAYS make time to respond to my friends.