Taking Rad at 18

I’m 18 and I am short and look underdeveloped I look very young ppl say I look about 14 my test level is completely normal but I need to look good for when I go out partying my plan is to keep training well for a couple more months then add in something rad looks like a good choice I’m 70kg 5,9 or so I don’t measure my height for some reason and I’m about 25%body fat based of what I can tell as I don’t have any visible abs at all nor do I have vascularity but I still have some shape to my muscles besides my legs lol I wanna get leaner and a little bigger. Is rad the right choice or should I go for something like ostarine?