working out demotivates me sometimes

as a beginner at the gym, lifting is one of my favorite activities, but sometimes i feel so demotivated because i keep getting injuries here and there and i always have to modify my program and take breaks. i don't even know what caused most of them to begin with. like one day i was doing shoulder presses and my elbow started feeling funny (i swear my elbows were not flared out). i've also had problems with my shoulders for a while too when i increase my lat pulldown weight. i've been stuck at the same weight for who knows how long? i work out 4 days a week; am i overtraining or something? honestly i think a personal trainer would benefit me but they are just so expensive and i don't know if i can justify it. it's just demotivating to not see progress and to have a bunch of setbacks when everyone around you seems to be healthy. i feel so fragile and i'm only in my 20s. i should be seeing beginner gains, not beginner pains ;-;

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