struggling

Every couple of weeks, I catch up on my best friends' blogs. There are three or four that I try to stay plugged into (although I often fail at that), and lately I've been so convicted when I read each of their blogs. It's so awesome to me how God works in my friends, leads them to blog about it, and in turn works in me. I so often pray that I can be that type of vessel for His work... Honestly, it's kind of my goal in life. I think it's the highest calling of a Christian, to simply be able to be used by God. Because really, He doesn't need us at all. He can do absolutely anything He wants, anytime, with anyone. And He chooses to work through little nobodies like us, just to prove how awesome He is (that He can work through such stubborn and selfish creatures as me). Anyway, when I read my friends' blogs, I'm also convicted of my lack of empathy, my selfishness, and my vanity. They are all continually selfless, compassionate, and boast in Christ alone- I am so very blessed by them and inspired by their Christ-filled hearts!
As you probably know, I've changed a lot in the past 8 months. This period of time has been the most growth-inflicting bit I think I've ever encountered so far in my life. Honestly, it scares me a little bit. While I LOVE London and can't wait to go back, I'm scared that maybe I got it wrong somewhere, and I start thinking of all the "what-if?"s. What if God wasn't saying that London will be my home? What if I never get to go back? What if all this change in my life changes my friendships too drastically to repair? What if I DO move to London, and I have to leave all my family and friends and start an entirely new life? What if I move to London and realize it isn't really the place for me and have to come back, dragging my tail between my legs (so to speak)? I know I *should* have faith in God, and I *should* trust His every move and I *should* never question him... But goodness, we all know I'm super flawed and sinful anyway. I know I need to take every thought captive to obedience in Christ and not let my worries consume me, but this is something I really struggle with over and over. Most people have addictions to porn or alcohol or sex... my addiction is worry and fear. I can't make myself stop. I know how, but just can't seem to make it happen and the prayers don't seem to be doing much right now.
If it offends you that I'm being so doubtful in God, just stop reading. I'm not going to apologize for the genuine outpouring of my heart.
Obviously, friends, I have a lot of growing to do. I have such little faith and such big worries. I fail Him daily... which makes it even more remarkable that He still chooses to listen to me and work in and through me. His love and forgiveness is extravagant.

God, calm my anxious heart. You are sovereign over me and my circumstances. Even when I am unsure of your plan and doubt your promises, you are faithful... and I am SO grateful for that. Please don't give up on me.