GA PLT MISHANDLED COM WITH PMP TWR AND VIOLATED CLASS D AIRSPACE.

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I WAS ENRTE FROM VERO BEACH; SBOUND; TO BOCA RATON; FL. PALM BEACH APCH HAD JUST RELEASED ME FROM FLT FOLLOWING AND I WAS TRYING TO MAKE CONTACT WITH BOCA TWR. THEY WERE NOT RESPONDING TO MY CALLS; SO I OVERFLEW THEIR AIRSPACE AND FIELD AND TURNED DUE W. I CONTINUED TRYING TO CONTACT BOCA TWR WHILE MANEUVERING W OF THEIR AIRSPACE. BY THIS TIME I WAS SW OF BOCA CLASS D AND DOWN TO PMP CLASS D WHICH A JOINS IT. I HAVE FOUND OUT AFTER THE FACT THAT I DID BREAK INTO PMP CLASS D. THERE WAS A CESSNA FLYING A PRACTICE APCH. HE WAS ABOVE ME AND TO MY L. I SAW HIM AND I STARTED TURN TO THE R AS HE KEPT DROPPING DOWN. HE WAS AT MY 10 O' CLOCK POS ABOUT 1/2 MI AWAY. I DIDN'T THINK HE SAW ME SINCE HE KEPT DROPPING AND DID NOT CHANGE COURSE. HE FINALLY BROKE FROM HIS PATTERN AND WE AVOIDED ONE ANOTHER. ON MY FIFTH OR SIXTH TRY I WAS ABLE TO CONTACT BOCA TWR. I DON'T KNOW IF MY PUSH-TO-TALK SWITCH WAS STUCK OR IF MY RADIO WAS NOT XMITTING OR WHAT HAPPENED. I TOLD THEM I WAS 3 MI TO THE SW AND REQUESTED TOUCH-AND-GO LNDG. HE TOLD ME TO RPT A 2 MI R BASE FOR RWY 5. I DID SO; FLEW THE PATTERN; AND DID MY TOUCH AND GO. THE CTLR TOLD ME ABOUT THE PRACTICE APCH WHICH CONFUSED ME AT THE TIME. ONLY AFTER LNDG AND CAREFULLY CHKING THE SECTIONAL DID I SEE HOW A TURN TO THE L OFF OF HDGING 270 DEGS COULD PUT ME TOO FAR S INTO PMP AIRSPACE. I HAD STAYED W OF THE HWY; BUT UPON REVIEW OF THE SECTIONAL; THE AIRSPACE DOES CROSS THE ROAD AT THE WESTERN MOST BOUNDARY. THE FACTORS THAT CONTRIBUTED TO THIS INCIDENT; IN MY OPINION; ARE THE FACT THAT THE ARPTS ARE SO CLOSE TOGETHER IN THIS PART OF FLORIDA. WHEN YOU CLEAR PALM BEACH CLASS C YOU ARE LITERALLY MINS FROM BOCA CLASS D. BY THE TIME YOU CHANGE XPONDER CODES AND RADIO FREQS YOU ARE THERE. THE FACT THAT I COULD NOT MAKE RADIO CONTACT WITH BOCA TWR FORCED ME OFF OF MY FLT PLAN. I THINK THAT THE CESSNA PLT WAS RELUCTANT TO DEVIATE FROM HIS PRACTICE APCH AND FLEW CLOSER TO ME BECAUSE OF IT. IT IS ALWAYS DIFFICULT GOING TO AN UNFAMILIAR AREA AND I AM SORRY THAT I PUT HIM IN THAT POSITION. HAD I TURNED R INSTEAD OF L I WOULD HAVE BEEN FAR AWAY FROM POMPANO TILL MY RADIO CALLS WERE ANSWERED. FLYING AT OR BELOW 1500 FT DOES NOT GIVE A PLT A LOT OF TIME TO SPEND STARING AT THIS SECTIONAL; ESPECIALLY WITH A RATHER LOW CEILING IN HOT FLORIDA WX. I AM GLAD THAT THIS SITUATION TURNED OUT OK AND I HAVE LEARNED A GREAT DEAL FROM IT.