Usually I bike, but for the same reasons. Sometimes I need to isolate just to clear my head, think things over, or temporarily escape from when life turns a bit upside down. Strangely I often don't figure much out while actually biking, but after I'm down a a bit tired the relaxation helps me think things through.
Does it irritate you when you're trying to "get away" to figure things out or relax, and people with good intentions want to prevent you from being alone?