i personally have no experience of online betting on bitcoin. but i think there are a lot of website by using which you can do online gambling using bitcoin. i have so many friends who know about this because they do it regularly.
i suggest you should play in sports. Sports betting is so popular until now because it can give you a great time while watching your team played online. The best things is when you are betting on that team you can feel the real thrill.
However, gambling is not only limited in sports because we also have the most popular dice.