i am 14 and 6 months old and 5 ft 6. i have only small growth spurts.

first growth spurt happened when i was 12 and i growed 3 inches in 6 weeks and the second growth spurt happened when i was 13 and i only growed 2 inches in some weeks... i never had a big growth spurt why ? how much do you grow in a growth spurt ? will i have a big growth spurt ? my brother is 1 year smaller than me and he,s getting spots on his face and forehead and he,s 2 inches taller than me.. is start having spots on face and forehead mean that you gonna grow very quickly ? i,ve seen lots of people my age when they start having spots thet grow taller is this true ? i start having spots from 1 month but im not growing very quickly ? if you had or going through growth spurt did you had any pains... if you had any pains then where does the pain happen ? and when do you start growth spurt after having pains ? ( just for your information my dad is 5 ft 10 )