What is the ruling on contemplating suicide due to suffering from short stature and people's harassment?

Short stature is not a defect that prevents marriage. The Prophet, peace and blessings be upon him, married Safiyyah, and she was short. What you are feeling is nothing more than whispers (waswas), so repel them with the remembrance of Allah and supplication. Allah Almighty says: "Unquestionably, by the remembrance of Allah hearts are assured." And do not pay attention to whoever bothers you, and remember His saying, the Almighty: "And when the ignorant address them [harshly], they say, 'Peace.'"

Marriage is a provision (rizq), so supplicate to Allah to facilitate for you a righteous husband. Allah Almighty says: "Call upon Me; I will respond to you." It is permissible for a woman to seek a husband according to the Sharia guidelines. As for suicide, it is forbidden and a great calamity that leads to misery in this world and the Hereafter, so never think of it.