I really wanted to learn how to make 3D models, but it turned out that the most I do is play with my sister's Play-Doh XD

If you want to, try it out with blender, its free. Play around with it, try make something simple like a pokeball, chair, table, etc. Stuck somewhere not know what to do to make certain thing? Watch YT tutorial. If you still into it by the end, then continue however u like.