Can one learn to behave confidently even when feeling insecure?

One thing that I’ve learned about myself this summer, that has made the top of my list of things I really really need to deal with soon, is that I still have some confidence issues.

For billions of reasons that I won’t get into here, I feel very insecure about my abilities as a programmer, which happens to be my major and career path, so kind of a big part of my life.

It also turns out that I’m someone who becomes nearly paralyzed when feeling insecure, enough so that I do not behave like myself, I become a far more awkward version of myself that I hate.

From where I stand I see two options:
1. Find confidence in my abilities somehow. Either I need to get a lot more skilled or I need to get good at ignoring reality, because my lack of confidence is grounded in reality – I really am not as good as most of my peers.
2. Learn how to conduct myself as though I am feeling confident all the time, even when I’m not.

Anyone have experience with self-esteem issues like these? Especially ones that affect the way you conduct yourself? Do you think that option 2 is a skill that can potentially be learned? Do you think that option 1 could ever happen without a large increase in my actual abilities – that I could learn to feel confident despite having good reason not to? Do you have any advice, or personal experience you could share?

Thanks.