It's been a hard week, I'm just sad

I've been feeling lost and alone for sometime now, and trying to maintain my composure during this COVID outbreak has been really difficult. I'm just sad all the time. I miss having someone to talk to, like I did before my relationship ended a few years ago. My coworker has been a good friend lately as he's invited me to go hiking with him and his gf last weekend. It was a good day. But when I'm home I just feel so empty. I hate isolating. And the truth is, even when society goes back to normal, I'm still going to feel lonely. I'm just sad. I want to find someone who will make me happy, but I don't know how. I don't know how to find the strength to stop feeling sorry for myself. I miss living life to the fullest. It's just so damn hard...