Alex, welcome to the forum. I have been here for less than a month myself and have found it to be helpful in alll the ways you mention.
I can sure relate to how you feel, as can many contributors here. Kind of like a ship without a rudder. It feels strange to have all this freedom after being part of an organization that controls every little thing you do, say and even think. Hang in there - with time the insecure feeling fades away and instead you will feel empowered to take control of your own destiny and really enjoy your life!
You will find support, opinions and advice here. Take what works for you and leave the rest. Everyone is coming from a different set of experiences and has their own perspective on life in the wts.
Good luck!