I feel your pain, I have a massive amount of interests and sometimes i'm overwhelmed by how much it would take to achieve a lot in everyone of them. At first I was deterred, a saying i've heard was "A Jack of all trades is a master of none" and I wondered if maybe i'd never truly excel at any? however, i believe that's true only if you execute your goals poorly.
I think in order to make good progress in all of your interests, you need to tackle them one by one.I developed a system of abilities (inspired by the game Final Fantasy IX)
Basically, each character had a list of abilities they could learn, but they needed a certain amount of experience points in order to use them, however, experience points earned would only go towards one ability at a time and once you gained enough experience, you learnt that ability, you could select another ability and go on to learn more and more until you went through all of them.
I think goals are much the same, if you try and tackle them all at once you'll get nowhere, but create a list, and tackle them one by one, until you have enough experience that the abilities for that skill are 'learnt', and move on to the next thing.
hope that wasn't too confusing.