Wa'alikum as-salaam wa rahmatullah,
The best thing to do is get good companionship. Try to find some good brothers to live with, or relatives, or someone. The best way to strengthen your feeling/iman is to study and reflect on Allah's names and attributes (so many of which are in the Qur'an) and take Islamic classes and stuff if you can, and listen to lectures and stuff if you can (FYI, AudioIslam.com is an amazing site.)
Also, you should regularly pray five times a day, all of them (as many as you can do -- work towards that goal). Also, after every salah, you can recite ayat-ul-kursi (and in general). Also, before sleeping, you should recite the "three quls" (minus surah kafiroon) as a set, three times, and then dry spit into your hands and wipe over your body. That keeps away shayateen and bad dreams and stuff.
We will make du'a for you. May Allah give you strength and steadfastness and protect you from fear.
Don't forget the hadith of rasulullah (salallahu alayhi wa sallam) who said: if the whole world got together to harm someone, and Allah did not permit it, they would not be able to harm him anything!
Allah is Al-Jabbar and Al-Mutakabbir and Al-Qahhar and all kinds of things; nobody can harm you with His protection.
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