New 1st grow. Can anyone help me out and let me know why this plant is so stretchy

[2HP_420LawsofCannabis]

This is the plant that’s so stretchy n I’m trying to mainline manifold it so idk the way it’s stretching kinda makes me feel like letting it just grow n probably just tie it down

 

[NEED 4 SEED]

We need more info about the parameters of this grow. Lights, soil/medium, timing, genetics, fertilizer...every single info counts.