How to deal with being invaded?

So I'm a silver player, but since the new season I've just been playing unranked draft to learn the new stuff and pick up some champs.

In these games I've been matched with plat and emerald players, and they invade much more than silver players.

How do I deal with these invades? The one that fucks me up the most is if I start red they steal my raptors. If I try to stop it, they hit 2 first and I die. My laners either don't care to defend jungle or aren't aware. I can only ward one side myself so I need help.

How do I deal with these situations? I don't mind opposite side invades because I can just cross and get theirs. It's the same side invade I struggle with.