22 year old starting.. i will not promote

So I’ve recently done a lot of research and I really want to get into the procurement/sourcing industry. And right now I’m doing this all by myself with no outside support. I’ve thought about getting into the restaurant/café packaging field where I can customize inventory to their needs and I wanted to know some feedback from you guys if this is something that would be a good idea All week I’ve been computing costs and finding potential freight forwarders, but now I’m really concerned on how to approach these businesses, because they obviously already have their own supplier and how will they trust a 22 year old that just appeared out of nowhere and agreed to start making deals with him?