That's super real.
My fiancee graduated in December of last year and has been working roughly full time since then. She has espoused similar feelings in the recent weeks.
I experienced much the same for a long time. When we first graduate college and enter the workforce it really does seem like that work and the necessary actions to maintain one's ability to work are all that there is time for.
With a good degree of work and intention, you can create time for yourself and your loved ones in your schedule. Whenever I hear 'I can't, I'm busy' what I'm really hearing is 'I can't, I won't make time for you.
Social hobbies are the best way to make adult friends. If you have an active one, even better. If you are an adult without a physically active hobby or pasttime, get one before you regret not getting one.
Your life from now on is exactly what you make of it. Every year composed of months, weeks, days and hours. How you live is how you will have lived.