Friendless at 46?

So here I am about to turn 46 and an ugly realization. I have no friends. Seriously no friends, no one I can call up and say "omg my 4 yo is driving me batties lets go get coffee and walk around somewhere till the day passes".
I have plenty of aquaintiences,  people who I know superficially and usualy call me when they want something. How do I know this. I cleaned my Facebook friends down and not a one noticed.  Ok so yeah that hurt but did not surprise me. But what hurts is when they send me pics of them going on a road trip saying oh you would of loved it but obviously I wasn't invited. So yay you win passive aggresive award there. Please do me a favor don't rub it in my face that you are doing things that you know I would love to do but do not want to do with me. Cause honestly I would not do that to you.
If I am a friend to someone I pretty much give that person the best of me. I remember birthdays, anniversary,  graduations, kids birthdays, etc...  If you are going through tough times I will call and check on you, give you a shoulder to cry on. Yet I have never recieved that back.
I some days think I must be a horrible person cause I do not have friends. I  find myself drawing back into myself further as a result. I am afraid to trust people now. Why extend a branch of friendship when all they want is for me to do something for them and then they go away.
I know what changed. 5 yrs ago I had grown children and free time. Then I was given the gift of miss thing. I was not expecting to be a parent again. I was not expecting that I would be a parent to my granddaughter.  But there she was, not wanted by her parents and bio dad would not sign over his rights. So we became parents again. I gave up a career for her. I gave up a middle age that had been planned to be just me and my husband. Do not regret it for a minute or a second. But I guess it also cost me friends.
Suddenly no one wanted to do things with us. No one thought that maybe I might need a shoulder to cry or laugh on. No wanted to hang out with me. Nope I was a parent woth a small child and suddenly that made me undesirable as a friend. Don't understand that, probably never will. Honestly moms make excellent friends. We appreciate things so much like your bad day at work is refreshing to us after we have just chased a naked toddler down the stairs trying to get them dressed so we can go out shopping. I would love to have an adult conversation that did not include the lyrics to Frozen. I would love to go shopping with someone who could honestly tell me if those pants looked good (a 4 year old is not going to be honest with you). 
Maybe someday I will find another good friend to hang with. Or maybe not.