Keep going
Not clear where, exactly, you're hitting the problem but if it's in judging the flare then there's already been plenty of good advice (and it's been a while since I landed a 152). The most important point of all being to relax and enjoy yourself - this is supposed to be fun after all.
If your problems start before the flare then maybe you're not judging the approach correctly. You need to manage the energy state of the aircraft, where you have both kinetic (speed) and potential (altitude) energy. Nail the airspeed and make sure you keep that speed and use the sight picture to judge if you're getting low or high. If you're getting low on energy (slow speed/low) then you need to bring in some power. If you're getting high (too fast/high) you need to reduce power, or add flaps. Be flexible. No two landings are the same.
Still, above all, relax (yeah, I know I said it twice) and have confidence in your ability to land the plane. Confidence will help you no end.
One final point - it may not hurt to try a flight or two with a different instructor to get some more input on your flying. A good instructor will have no problems with you doing this and, in fact, it's exactly what I did for one flight when I was having trouble nailing wheel landings in a Citabria. A different perspective can really help sometimes.