>How do I gain more glutes & thighs
Do squats
Do leg presses
Eat a lot of protein & healthy fats
>Also I’m 5’1 so is that average or slightly short for a woman?
Pretty damn short even for a woman kinda, the average female height is around 5’3-5’4. Too bad your younger brother is significantly taller than you
>I might need more help for my gym transitioning goals, any advice?
Just keep exercising and eat more healthy, (eat foods like lean meats, greens, fruits, nuts, etc.)