In the real world, if you want something really effective without any pretensions to being a sport or an art or anything, do Krav Maga.
If you want to fight for real, look at aggressive combat styles, like Krav Maga or Systema, which try to deal as much dammage as possible, in the shortest ammount of time, without considering the concequences to the opponent (= possible death). By the way, these are banned in UFC, beacuse they are too dangerous to the opponent. UFC is still a spectator sport.
Note: I'm an ex aikido practitioner and a current krav maga practitioner.
Correct. Self defense should more or less follow this pattern:
1. Situation Awareness (being aware of danger)
2. Avoid (leaving before trouble occurs)
3. De-escalate (using words)
4. Evade (run)
5. Force