Will this feeling last forever?

I'm 24. I know, I'm young and I feel young. But I also feel like life has flown by sooo much during the past 6 years than it did for my first 18 and that kinda scares me. I'm single, I have friends though none live near me as they have all moved to different cities or states-I have found recently that I'm having a much more difficult time making genuine friend-type of connections with people within the last year, I'm not sure why. I am in the beginning stages of my career choice and advancement is well within my reach. I just feel so lonely and like I will always feel this way because of the state of my circumstances now and how fast time is passing by. Anyone ever felt the same or have advice on how to cope with these feelings? I'm usually the advice giver, so I need some of my own medicine.