Don't pick a hero. Pick a role first. The role determines your playstyle more than the hero does.
If you like being the frontline, absorbing damage, and starting fights → play Clash Lane (Tank/Fighter).
If you like roaming the map, surprising enemies, and making big plays → play Jungle (Assassin/Fighter).
If you like doing huge damage from range and carrying late game → play Farm Lane (Marksman).
If you like controlling the battlefield with spells and burst damage → play Mid Lane (Mage).
If you like helping your team, setting up kills, and being the unsung hero → play Roam (Support).
Try each role for 3-5 games. You'll know which one feels right.