My dear TS,
I think you're still in the age of just wanna have fun with your bf/gf
U afraid and not wanting to think bout marriage maybe bcuz u are afraid of more responsibilities lie ahead. FOr now, u just wanna enjoy, enjoy and enjoy without thinking of taking r/s to new level.
I believe if you have this thinking in your current r/s, ur r/s might not last long. and you both perhaps just wanna have fun as a couple..
But this is normal especially if the gal is very young.. Time will tell when u feel like wanna take this r/s to new level..
For now, just have fun

If you're really young, dun get too serious on any r/s till u get a little older. Cuz for young people to couple, many tend to just play around without thinking ahead.. So dun get too serious or you wil regret