Welcome to SRP! Starting young is great. I started around the same time you did, but never got serious about it until more recently.
On the plus side, if you happen to live in a dorm and the ladies see you using a straight razor while all of the other boys are using a gillette fusion... you'll have an enjoyable college experience. just dont let them see you hack your face away
As for the burn, some of that might just be your skin getting used to shaving with a straight, but part is very likely the angle and pressure you're using in combination to the direction you're shaving in relation to the "grain"
definitely check out the library here as that's where I learned pretty much everything I know, and ask questions! It's a fun and enjoyable experience learning