Man, when I get those feelings to just go out, be in nature, and connect? It’s really something else. 
Amethyst and Siofra have mentioned grounding and just existing outside in nature. Those are great options! I wanted to add in some links that might help you, too.
→ Tips for Grounding and Centering
→ @SilverBear has a video about the healing power of nature 
Nature Heals -- LOVELY!
If you’re struggling with any of that, I’d say just take a few minutes to sit outside. Listen to the world around you, stand with your feet in the dirt, or sit close to a tree in your area. Once you get out of the funk of feeling outside of nature, it’s much easier to recognize that we are nature itself. We are not outside of nature – we all exist together, though we as a species have separated ourselves from nature as much as we possibly could. 
I hope you can find a way to connect again!