To run or not to run....

First, let me post my accomplishments today:
I made it to the gym....yeah!
I did about 30 min on the treadmill....set on cardio so my heart rate stayed up quite nicely. Then braved some free weights. My goal is to do more free weights and less on the machines~but I'm, for some reason, scared of the weights. I'm just afraid of looking stupid when I'm trying to work with them...yes I know that is silly.
So I mainly worked on upper body, some on lower.

What have I ate so far today....
I had a small bowl of Kashi -the shredded wheat kind.
large coffee
large iced tea (unsweet)
banana
some hickory smoked tuna
a yogurt (weight watchers)
one of my favorites: wholly guacamole 100 cal pack with sugar snap peas.
Oh, I had some baby carrots.
.........and now, as we speak, a lady just stopped my my office, said 'Merry Christmas' and placed some type of Christmas candy on my desk.........errrrrrrrrrr
I just said 'wow, thanks!'---and now it is staring at me. What should I do?? Six pieces of candy....The thing is, I would feel ok eating like two of them, but I know me. If they are sitting here I will eat them. I don't want to throw away her hard work at making this candy. ok, taking two out, and hiding the others in my gym bag. Maybe I'll forget about them. Goodness, I have a sweet tooth now!

Ok, on to the running. I have never been athletic. I was a very good student in school, but I remember the only time I ever acted like I was sick to go home were on the days that we would have to do some big running event....like a half mile or something. And despite the fact that I was an A student, I got a D in tenth grade P.E. That is really hard to admit, but I didn't want to "dress out" to work out. I was stupid.
I have dreams sometimes about running. I am running through the woods feeling the air flow through my hair, and it is exhilarating. I wonder if that is what it feels like for people who say they love running. I have decided that I want to be one of those people. I want to love to run. So, today when I was on the treadmill at the gym, I ran...or jogged. Do you want to know for how long??? .5 miles...or wait, no that isn't right, its .05 miles. Is that pathetic...don't answer, I know it is. I am ashamed. Now, I think once a week, I will push myself to increase that by at least .05. I want to be able to run a mile. I think that would be so cool.
I do have obstacles. To begin with, I have this 300+ lbs that I am carrying, which does not like jarring motions. My whole body is in shock when I try to run. I have a sports bra, but it isn't perfect...I want duct tape, and I want it all over myself. My other obstacle is I do have arthritis. I've been diagnosed with it for a while, but I'm not medicated. I feel aches every now and then, but nothing major. I worry that running could hurt my bones more. ..........so I don't know what to do. Does anyone know how a non running fat girl should train herself to be a runner?