All time stock market highs, inflated stock prices due to HFT bidding up prices and thus siphoning off money by the billions, companies operating at a loss or m

All time stock market highs, inflated stock prices due to HFT bidding up prices and thus siphoning off money by the billions, companies operating at a loss or minimal profits getting billion dollar valuations, it's been a while since the last major stock market drop hasn't it?.. Is it just me, or are we playing with fire here? It seems like if one thing goes wrong the whole house of cards will come crumbling down. I'm worried about my retirement after reading more about HFT. Where should I put my 401k to avoid losing a big chunk of it as soon as the market takes its next drop?