can dissolving be endothermic process
The answer to your question in general is yes.
There are many salts and compounds that are endothermic - they cool the solution when they dissolve.  It also turns out that glucose is endothermic when it dissolves if this sheet i found is to be believed.  Its not a strong effect but you made an accurate observation!

Endothermic salts can be quite cold.  This is how home ice cream makers often work in fact - rock salt dissolves into the ice and makes it even colder than it started out to be. I believe that is how ice cream was made before refrigeration and ice storage arrived in the 19th century.