Is it normal to want my girlfriend to dress slutty but I’m too jealous

I don't think you should be telling your girlfriend how to dress. If the idea of her dressing in a way you find attractive makes you jealous, you should probably ask yourself why, cause jealousy and wanting to control your partner are a bit indicative of not trusting your partner or not being secure in your relationship.

While you might be young and have more to learn about give and take, probably don't tell her what to wear, because while she may do it, it's something you might both end up regretting, maybe not now, but at some point.