Spatiotemporal optical vortices (STOVs) carrying transverse orbital angular momentum are a new type of optical pulse wave packet, and attract more and more attention from researchers around the world. In this paper, we present a method of generating linearly polarized STOVs with controllable polarization states on the focal plane of a high numerical aperture lens. The incident wave packet is pre-split to overcome the spatiotemporal astigmatism caused by the focusing lens to the STOV. The three dimensional spatiotemporal distributions of the highly confined STOVs with different polarization states are simulated based on Richards Wolf vectorial diffraction theory to analyze their intensity and phase characteristics. The obtained horizontally polarized, vertically polarized and 45° polarized highly confined STOVs manifest the feasibility of the presented method.