STUDENT PLT ON INITIAL SOLO AT UNCTLED ARPT HAS CONFLICT WITH ANOTHER ACFT TAKING OFF IN OPPOSING RWY DIRECTION.

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THIS WAS MY FIRST SOLO FLT. WE DID 2 FULL STOP TAXI BACKS USING RWY 16. THERE WERE A COUPLE OF OTHER PLANES IN THE PATTERN DURING THIS TIME. I LET MY INSTRUCTOR OUT AFTER THE SECOND LNDG AND PROCEEDED TO TAXI TO RWY 16. WIND DIRECTION WAS NEUTRAL; BUT SINCE WE AND OTHER ACFT HAD BEEN USING RWY 16; I STAYED WITH RWY 16. THERE WAS NO TFC IN THE PATTERN AT THIS TIME. RIGHT BEFORE I ROLLED ONTO RWY 16; I HEARD FAINT STATIC FILLED RADIO CALL ON CTAF. SINCE IT SOUNDED SO BAD; I THOUGHT IT WAS A DISTANT ACFT ENTERING THE VALLEY. I THEN ANNOUNCED I WAS ROLLING ONTO RWY 16 FOR TKOF. RIGHT AFTER THAT; THE OTHER ACFT ANNOUNCED THEY WERE TAKING OFF ON RWY 34. I IMMEDIATELY STARTED TO TURN AROUND; BUT BEFORE I COULD; I SAW THE OTHER ACFT LIFTING OFF MIDWAY DOWN THE RWY. I STOPPED WHERE I WAS; WHICH WAS OVER TO THE L SIDE OF THE RWY NUMBERS. THE OTHER ACFT TURNED AWAY BEFORE IT FLEW OVER ME. THE SIT COULD HAVE BEEN AVOIDED IF I HAD CALLED ON THE RADIO IMMEDIATELY AND NOTIFIED THE OTHER ACFT; OR IF THE OTHER ACFT USED THE SAME RWY THAT HAD BEEN USED FOR THE LAST 30 MINS. THIS SAME ACFT HAD USED RWY 16 JUST 15 MINS PRIOR.