I need your help please !!!!!!!!xxx?

Rights here's the deal, I'm 14 and I'm not exactly pretty I have a big nose, spots, oily skin, thin hair and I'm quiet but outside school I'm really loud and funny I don't know why ?? So has any one got ideas to help me like skin care ideas, makeup ideas for school, hairstyles for school, any good beauty tips and tricks and any ideas why I'm quiet in school and loud outside xxx