may your heart be warm, but your bowl of soup warmer
serious answer: I ran some quick math (below the cut) and found out that this ant would impart about ten times the amount of energy as an impact by a 45kg Howitzer round, or one thousand times the energy yield of a typical handgrenade. Ordinarily I would expect something like an ant to disintegrate on impact at high speeds, but there is simply so much energy in that ant that it would have nowhere else to go but forward - even if it completely exploded on impact without penetrating, you would definitely die and definitely need a closed-casket funeral. If it simply went straight through without meaningful disintegration, carrying the majority of its energy away with it, with this being a hypersonic projectile (actually, it's a relativistic one) it still would definitely shred at least a grapefruit-sized hole in you just from cavitation damage. Given the ridiculous speed, it would also create a significant amount of heat and a concussive sonic shockwave as it did so, definitely killing you instantly and probably turning you into charred ground beef.
TLDR yes you would be super mega dead
oh but the ant so small I can take it
that's true I didn't think of that