What should i do to make my hair look thicker?

Same with me too. What my hair-stylist did, was to layer-cut my hair, so that it looks fuller, bouncier. I'm not sure how he does it; maybe you could check with your hair-stylist.

I have seaweed on a rock kinda hair. Flat, limp, stright, baby fine hair. I just keep it in medium layers. If you tell them short--they give you a mullet, and if you say long you get the ends trimmed. Find a style that will suit you with medium layers all around and then get some high and low lights. These creat dimention! Good luck!

There are many hair thickening products that you can use for this. There are many brands, you just have to find the product that works best for your hair type. Have you tried Pantene or Garnier Fructous?