I'm 19 been training for 3 1/2 years bout 4 days a week. No cycles just taken fat loss to get down from being fat when i first started. goals just to be more happy with myself and how i look and train and to be healthy. ive been plateauing for about 3-4 months need a boost to get out of it
if you're stuck in a rut, switch your exercises out. 19 as mentioned earlier is way too young (21 being what the label claims is an ok time to start, 23-25 being whats recommended). if you're looking to make mass gains, ditch the isolated moves, and do more compound exercises.
you say you've peaked. what is causing this? either your workout has become stale (body too used to it), you're overtraining (unusual at 4 days on, though you could take a week off), your diet is off, you started smoking/drinking, or you're not sleeping enough.
i'd spend some time thinking about whats going on, and fix it. if you need a week off, then take it. are you taking a preworkout protein + slow carb drink? are you taking protein + fast carbs post workout? at 19 you have so much test flowing that you really shouldn't need anything else. thats all i got.