A C340 PLT EXPERIENCED ALTDEV; ALONG WITH NUMEROUS COURSE DEVS ENRTE FROM PALM SPRINGS TO SAN DIEGO.

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I WAS ON AN IFR FLT PSP TO MYF; SINGLE PLT WITH 1 CHILD ON BOARD. I RECEIVED CLRNC FROM PSP AS FOLLOWS: CLRED MYF VIA PSP 4 DEP; DIRECT TRM; V514; MZB DIRECT MYF. AFTER DEP; DURING THE CLB; I WAS GIVEN A COUPLE OF RADAR VECTORS; THEN DIRECT TRM; V514; MZB DIRECT; CONTACT ZLA. I INTERPED THE INSTRUCTIONS TO GO TRM AND MZB DIRECT; CONTACT ZLA. AFTER XING TRM; I TURNED DIRECT MZB AND CONTACTED ZLA. THE CTLR WAS EXTREMELY BUSY. APPROX 10 MINS LATER; THE CTLR INFORMED ME I WAS NOT ON COURSE; AND ASKED WHERE I WAS GOING. I TOLD CTLR I THOUGHT PSP HAD GIVEN ME TRM AND THEN MZB DIRECT. CTLR TOLD ME I WAS WRONG AND THAT PSP WOULD NOT HAVE GIVEN ME DIRECT. CTLR TOLD ME TO MAKE AN IMMEDIATE 50 DEG TURN TO THE L; I WAS BELOW MEA. BECAUSE I WAS BELOW THE MEA; I MADE A CLBING 50 DEG TURN TO THE L. THE CTLR THEN TOLD ME I WAS 600 FT ABOVE ASSIGNED ALT. I MADE THE NECESSARY CORRECTION AND LEVELED OFF AT 10000 FT. CTLR THEN SAID I WAS 'CTRLINE' AND I THOUGHT CTLR SAID 'ON LINE.' I PROCEEDED TO SHOOT THROUGH THE AIRWAY. THE CTLR THEN ANNOUNCED I HAD SHOT THROUGH V514 AND SENT ME DIRECT JLN; V514; MZB DIRECT. AGAIN; I INTERPED DIRECT JLN THEN MZB DIRECT. I WAS HANDED OFF TO MYF APCH; WHO SET ME UP FOR THE ILS RWY 28; WHICH; BELIEVE IT OR NOT; I ACTUALLY SHOT WITH PROFICIENCY. AFTER LNDG; I WAS TOLD TO CONTACT ZLA. ITEM(S) THAT LED TO MY DEMISE: I WAS BOI-MYF FOR ADDITIONAL INST TRAINING; SINGLE PLT. THIS WAS THE FIRST FLT IN MY PLANE SINCE LOOSING AN ENG AT ALT (2 MONTHS PRIOR). THEREFORE; I WAS A BIT APPREHENSIVE. I WAS 5 1/2 HRS INTO A 4 HR TRIP; WITH 1 UNPLANNED FUEL STOP. DEPARTING PSP; CONDITIONS WERE HOT; BUMPY AND HAZY; WITH A LOT OF TFC IN THE AREA. I WAS UNFAMILIAR WITH THE AIRSPACE AND RTE. I HAD LITTLE OR NO COCKPIT ORGANIZATION. I BECAME FLUSTERED AND FELL BEHIND THE AIRPLANE. I HAD ABSOLUTELY NO IDEA WHERE V514 WAS OR HOW TO GET ON IT. ONCE THE CTLR LOST PATIENCE AND STARTED VERBALLY VENTING HER FRUSTRATION AT ME (EVENTUALLY ASKING ME TO VERIFY THAT I WAS 'ACTUALLY' INST RATED) MY ONLY GOAL WAS TO FLY AND LAND THE PLANE SAFELY.