Choppy Minecraft gameplay

I just got new Minecraft yesterday and my game is now super choppy, I’ve already tried changing different video settings but it hasn’t helped that much.

I want to download mods and stuff but I’m afraid it’ll make my gameplay even worse or use up too much space, I only have 8 GB of ram on my computer.

Also does OptiFine really help? By how much? Would it make the game playable on my PC? Cause right now it’s really now enjoyable… sadly.