So I decided 2 weeks ago on the program I was going to accept. I declined an offer to a very good professional program in favour of a PhD in Comp. Biology. For some reason, at the time, and the following 2 weeks, I was delighted with my decision. Right now, I regret it. I feel like I don't have enough experience, and I'm not quite sure if I will be able to succeed. I have the skills in their raw form - I know my biology, statistics and programming - but I don't have any experience putting all of it together (and I made this clear in my application) in a research setting.
Is it normal to feel this way?