Is it weird to date a guy smaller than you?

No its not, its perfectly fine to date whoever you want. it depends on what you want and look for in your ideal partner. if you dont want to date someone shorter and hes already grown as much as he can give him a chance but if you realllly dont want to date someone shorter, dont.

Is it good to date a short guy?

Dating a short guy implies, being with someone who looks at you beyond your physical appearance. He can be compatible with you at various levels and there are high chances of a lasting relationship. Studies confirm that shorter men make more faithful partners and are less likely to get a divorce.