CESSNA 152 STUDENT PLT INADVERTENTLY FLY INTO CLASS B AIRSPACE AFTER BECOMING LOST DUE TO ENTERING IMC CONDITIONS DURING A SOLO CROSS COUNTRY FLT.

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ON DEC/SAT/01; I WAS RTNING FROM A SOLO XCOUNTRY FROM KTIX TO KSFB. I INADVERTENTLY FLEW INTO AN AREA WHERE VISUAL REFERENCE TO THE GND COULD NO LONGER BE MADE. I TURNED THAT ACFT AROUND TO FIND AN AREA WHERE I COULD REFERENCE THE GND TO OBTAIN MY LOCATION AND LAND AT AN ARPT. DURING THIS PROCESS I ENTERED CLASS 'B' AIRSPACE UNKNOWINGLY. I WAS ABLE TO FIND AN AREA WHERE I COULD CIRCLE TO TRY TO DETERMINE MY LOCATION. MY FIRST OBSERVATION WAS THAT I WAS IN AN AREA MUCH MORE DENSELY POPULATED THAN I HAD EXPECTED. I WAS ALSO ABLE TO SPOT A LIGHTER THAN AIR TYPE ACFT WHICH I HAD HEARD CONVERSATIONS OF ONE IN THE ORLANDO AREA. I MADE A DECISION TO HEAD EAST AND CLB TO AVOID THE ORLANDO VICINITY. I SWITCHED TO ORLANDO APCH TO ASK FOR MY POS AND VECTORS TO SANFORD (KSFB). AT THIS POINT; ATC NOTIFIED ME THAT I HAD ENTERED CLASS 'B' AIRSPACE WITHOUT CLRNC. I EXPLAINED THAT I WAS LOST AND THE CTLR WAS VERY HELPFUL IN VECTORING ME TO SANFORD. I WAS UNABLE TO MAINTAIN VFR FLT CONDITIONS IN ANY DIRECTION AT THIS POINT. ATC WAS ABLE TO GUIDE ME THROUGH A DSCNT IN IMC CONDITIONS THAT ENABLED ME TO USE VISUAL REFERENCES TO RTN TO SANFORD. CONDITIONS DID NOT ALLOW ME TO MAINTAIN VFR CLOUD CLRNCS. I DOD NOT KNOW IF I REQUESTED SPECIAL VFR FOR LNDG. IN RETROSPECT; I LEARNED A GREAT DEAL FROM THIS EXPERIENCE. I WILL CERTAINLY BE MORE AWARE OF THE WX CONDITIONS AND THE CHANGES THAT ARE OCCURRING. I WILL ALSO COMMUNICATE WITH ATC SOONER TO PREVENT INADVERTENTLY ENTERING CLASS 'B' AIRSPACE. THE TRAINING THAT I HAD RECEIVED; ALSO WITH THE HELP OF ATC SAVED MY LIFE AND POSSIBLY OTHERS. I WILL CONTINUE TO STRIVE TO BE MORE SITUATIONAL AWARE AND EXERCISE GOOD PIC JUDGMENT.