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I'm the same way and I've found there's no real way around it. I've found it's actually a really useful way of thinking for complex projects and planning and prioritization, but bad for getting things done. The only things that work for me to manage this:

1. Relentlessly make distractions high friction. Block websites, go to the office if you get distracted at home, etc.

2. Use time-based daily planning instead of goal-based (stuff like pomodoro helps). If I put "create work plan for project Z" on my to-do list, it is ambiguous and I will put it off forever. If I just say "Spend 25 minutes on work plan for project Z, no pressure on outcome/output", I make tons of progress (and often can continue the task for a while)

3. music

4. the obvious diet/sleep/meds advice