Best $150 budget at 15:
1. CeraVe cleanser + vitamin C serum + SPF50 sunscreen (~$35) — highest ROI move, period. Skin texture changes how light hits your face
2. Derma roller 0.5mm (~$15) — stimulates collagen, improves skin texture over 8-12 weeks
3. Tweezers + eyebrow scissors (~$10) — clean up brow shape. Most underrated softmax
4. Resistance bands or adjustable dumbbells (~$40) — posture + neck thickness changes how your jaw looks
5. Silk pillowcase (~$20) — reduces sleep creases and skin irritation
6. Minoxidil for eyebrows if sparse (~$15) — takes 3-6 months but works
Save the rest. At 15 your face is still developing — don't waste money on anything structural yet. Focus on what compounds over time.