Can you overtrain without being sore?

Hey,

I train 6 times a week doing a push pull leg split 2x a week, for over a year now. I have been at a platue for quite some time. I push almost every set to failure and i also inplement dropsets (maybe not beneficial, but i like doing it). And i never get sore even though i train to failure almost all the time. I feel like i get enough sleep (8 hours) and i eat decent (could be better). Is there a possibility that my gains and strenght progress is hurting because i am training to much? Maybe my body doesnt have enough time to recover? Or should i be fine as long as i dont get sore? Thanks for the help guys :)

Since a lot of you have been asking about my program:

I do most compound exercises 3x8 and single join exercises either 3x12 or 3x15 depending on the intensety of the workout. I do this split 2 times a week.

Push, chest tricep delts Pull, biceps, back Legs legs, abs, arms
Bench Press, Dumbell overhead press, Dumbell press, Skull crusher, Dumbbell lateral raise, close grip bench press, Pull Up, Deadlift, Barbell curl, Barbell row, Dumbell curl, Shrug, Squat, Calf Raises, Hip thrust, Abb exercises, Pronated forearm exercise, supinated forearm exercise,

A litle more information since i havnt provided enough info:

i am 15, i have been training for 3 years. I devoloped an actual good physique imo, (i can share progress if yall really want me to :). I achieved it by doing a 2x push pull leg split. My 1 RP is 63kg i weight 62 kg. I am not satisfied with that number not becuase its so extreamly low but more because it has been 63 kg for 2 monts. My physique has changed quite a lot in those 2 monts, but my strenght hasnt. So i made this post asking if my strenght hasnt increased becuase i might have been training to hard, wich resulted in to litle recovery?