I've hit puberty but my penis is still really small

I am writing this because i have some worries about my body. I've hit puberty but my penis is still really small when flaccid like 2 inches or less but grows significantly when erect. when erect it ranges between 6-7 inches depending how "hard" i am. so i would like to know if its going to grow at all anymore while its flaccid I am 16 years and about 5'9 weighing about 140 and i have had sex before and now I'm not being able to get turned on in the moment its like my body fails to get erect when i need it to but it didn't use to always be like that why is that happening? I've read things and it says that i think to much and need to relax but when i tried to relax it made me think more and I've tried not thinking but the more i try not thinking i think more so any suggestions and answers would be nice