I deal with some of the issues you do - namely agoraphobia and isolation. I seem to go the opposite way when it comes to looking to others for support though; I just don't look to or expect anything from anybody. I'm sure there's a middle ground between us and it's probably important to find that. Nobody can save us from ourselves but it's important not to cut everyone out too (as I have). Some therapy may help with the balancing act but even just becoming aware of it is a great first step. A friend or two you can exchange ideas with both ways might help too even if they're just online. The good news is that you're catching it so early in adulthood - not that changing it is a walk in the park, but still good news. Good luck!