I hate that my nipples are in and is not vissible through my T-shirt so I want to try this thing but I'm too shy to buy it

I even thought maybe I can ask my friend to buy it for me if I give him money back but maybe I'm sure he will laught at me.
Has anyone tried nipple sucker pumps?
Maybe you can suggest me any other method? It looks like I have no nipples and I can't like my body because of it, I'm looking to other girls who have it and am so jealous.
I know that if a boy loved/wanted me he doesnt care about it but I care about it and want to do it for myself to feel pretty and sexy.