Being afraid of death is pretty common even among Christians. I think that if you stay strong in your faith, continue to grow and learn to be secure in God, then over time that will diminish. You're still young and are a 'baby Christian', so you have to expect to think, operate and trust at that level. You're not going to have the same faith and trust as someone who's been a solid Christian for 30 years. So don't worry about the fear, just keep your walk going and growing and the fear will dissipate as you grow closer to God.
Peer pressure. I had almost no pressure as a teen to ever smoke, drink or do drugs. And my high school probably had a 95% or higher amount of kids that did these things, higher than the average high school. But the reason i was never pressure is i always made a big deal about how i absolutely do not do these things, don't want to, and refuse to. I eventually developed a reputation as the guy 'not to bother with' when it came to that stuff.
And to back it up, i was very very blunt about my faith as well. I sometimes wore Christian tshirts. I didn't use a backpack, so i carried my school books around and always had my bible on the top of them all.
I had one guy i didn't really know, in class he tried to sell me pot. I told him emphatically i don't smoke or drink and don't want to. He was surprised i had never even tried pot, so he offered some to me for free. I repeated my strong stance, boldly, against using. He said if i changed my mind to let him know, but he never said another word about it again.
If i was around friends who started discussing drug or alcohol use, i always spoke right up and announced i didn't touch any of that stuff. Basically, what i did was i took an offense position. Instead of waiting for people to pressure me and defending myself, i put myself out there before people ever approached me.
To keep true to your faith is just a daily battle, one you will likely face your whole life, as we have to battle our flesh daily. Don't stress over the battle, just remember the victory is already won through Christ. Just do your best, seek God for support and don't stress.