Feelings around my new job

So I'll be starting a new job next week. They have arranged for me to go to Melbourne (I'm from Sydney) for 4 days to do some training. It's a good opportunity, and great that they are covering all the costs etc. 

I'm quite worried and nervous though. Both in terms actually getting there and doing the training and the work, and also in terms of the time I will have by myself, especially in the evenings.

I'm trying to stay positive about it and not to think too much. But inside I'm scared. I'm not sure how I'll cope being totally on my own and without any distractions from myself and my thoughts.

The changes that are happening surrounding this job has really hit me hard these last few weeks. I can see all the pros of it that everyone else can see. And the practical part of me agrees with them. But as much as I try to convince myself, I can't seem to feel more positive about it. In my heart, it's not something I want to do. There is fear around change and doing something new and unknown, and I know that that is also contributing to my apprehension about the whole situation. But mostly, I don't feel positive about it because it's something I'm doing because it's what expected of me, it's what anyone else in my situation would probably do.

And it's a constant struggle trying to come to terms with the reality of it. Even thinking about it now is causing a tension in my body. I feel like every part of me is fighting against it. My head is constantly trying to remind myself that this is what I should and therefore have to do. Whilst the rest of me is at a lost as to how to cope with whatever it is that I'm feeling right now: dread, fear, anxiety, sadness, a sense of resignation.