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I want to see the tcp segments sent from my machine.

If the capture is made on the sender and it does TCP offload or on the receiver and it does TCP offload, then the individual segments are created/rolled up at a level lower than Wireshark captures. To see what's on the wire, the best place to look/capture is in the middle on the wire.

Background info:
Wireshark Wiki - Offloading
Packet Foo - The drawbacks of local packet captures
Wireshark Wiki - Ethernet capture setup
Packet Foo - The Network Capture Playbook Part 1 – Ethernet Basics