I have large hips and thighs, the rest of me is sort of skinny, how can I make my hips and thighs smaller?

Walking and exercise, but what do you mean by large? Many men love large hips and thighs.
Hips, Butt and Thighs - Exercises for your legs - Exercise

If you feel really self conscious, you can walk more and do some leg lifts and squats to tone your legs. Also, you can stick a big ball between your legs and squeeze your legs together, this will tighten any jiggles.
Also, go swimming and do laps, kicking helps burn any calories and tones.