Beech F90
Flight Crew Commercial; Flight Crew Flight Instructor; Flight Crew Instrument; Flight Crew Multiengine; Other Remote
Flight Crew Last 90 Days 30; Flight Crew Total 6200; Flight Crew Type 1300
Situational Awareness
Conflict NMAC; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter Weather / Turbulence
Flight Crew Took Evasive Action
Aircraft; Human Factors; Environment - Non Weather Related; Airport
Arriving ZZZ on IFR plan.  Initially wanted to perform GPS XX due to rain and some lower clouds scattered around airport area.approximately 10 nm south of field; called TRACON and informed them I had the field in sight and would cancel IFR after acknowledgement contacted ZZZ Traffic via CTAF.Two aircraft were in pattern for [Runway] XX; I called south of field 7 nm and informed traffic that I would remain east of field at 1;600 feet MSL until I had traffic in sight.I flew what amounted to a left downwind for Runway XY and picked up a Cessna departing upwind for crosswind off of XX.  we were in contact with each other when I was alerted to a helicopter below via a radio transmission from that traffic north east bound away from field in a position below me with no alt read out or announced; and a second pattern aircraft a piper on final for XX which i assumed was in the pattern training but never got in sight.While remaining VMC avoiding some lower scud clouds in area and flying through light rain; looking for both the helicopter and piper; I lost visual with the Cessna on downwind for XX; during my maneuvering I lost position awareness believing I was due north of the field and made a base turn calling base to final XX for a full stop landing; on the descent I noticed the Cessna coming towards my position.  he was calling downwind for XX; he was level and I didn't think he could see me due to our closing angle so I descended to remain clear of his path; calling traffic in sight and called final XX continued to the landing...I had inadvertently aligned for XY and was not in the position I announced; I was free from traffic and made a routine otherwise uneventful landing.During my after landing self-critique I realized / reviewed my errors:1)FPL mode on G1000 PFD and MFD displays were not showing real time position due to the cursor mode and Runway XX GPS approach data being left on screen.2) Navigation around some lower clouds and traffic had me looking around and distracted me from dialing in the new runway alignment which is typical practice for our operations.3) Looking for traffic and distractions led to the disconnect between my perceived and actual position.Corrective actions:  will be to enter traffic patterns from more typical locations instead of shorter direct to downwind entry; as well as dialing in correct landing runway orientation or approach guidance to verify against my position when approaching uncontrolled fields.
Beech F90 pilot reported an NMAC during final approach.