Recent advances in reinforcing lateral-load resisting systems with glass-fiber-reinforced-polymer (GFRP) bars have highlighted the need for farther experimental investigations. With the elastic behavior of GFRP-bars, ensuring sufficient plastic deformations become challenging. The current study presents the experimental work performed on six full-scale GFRP-reinforced concrete shear walls with boundary elements. The mid-rise building shear walls were tested under reversed quasi-static cyclic loading, with an emphasis on how varying the configuration of the boundary-element confinement would influence their strength and deformation performance. Two shear walls had boundaries reinforced with square GFRP spiral stirrups, while a third had boundaries reinforced with circular GFRP spiral stirrups. The remaining three shear walls had higher confinement in the boundary elements; one had a square GFRP spiral stirrups embedded inside rectangular GFRP spiral stirrups. The second had a rectangular GFRP spiral stirrups with two GFRP ties in the middle, and the third had two square spiral stirrups overlapped side-by-side. The overall performance of each specimen was characterized by investigating the hysteretic response, the cracking patterns, the drift ratio, the strength capacity, and the behavior of energy dissipation. Also, the strain progressing in the longitudinal, horizontal, stirrups, and concrete was investigated. The obtained results demonstrate that increasing the confinement level in the boundary elements enhanced deformation capacity and increased the overall strength of the GFRP-reinforced shear walls by developing a higher level of concrete compressive strains and a better distribution of shear deformations over the height.