Depends on the wax, paraffin melts at about 37°C (99°F). Soy ranges depending on the blend, anywhere from (49-82)°C or (120-180) °F. There are many different types and blends, so just look up the range for whatever materials you're using.
Losing weight as a teen can be tricky. Ask for help from your parents and make an appointment to see your doctor and dietitian. Remember, everything is okay in moderation,...
That may happen if heat is dissipating from the tin foil faster than it can be generated. Insulating the tin foil and/or blocking any wind from cooling it should yield...