Do you have advice on how to meet new people and to make friends ? I'm feeling really empty

I'm 18 years old and to make it short my now ex-girlfriend dumped me last week to go with my best friend after 3 years of relationship and it's too hard for me to deal with it so I cut off contact with both of them but I realised that I don't really have real friend now. At the same time I have to study all this month for my exam and I feel really empty and lonely so it's hard to keep up with everything. Do you guys have advice to find new people after my exam session end ? Or how to make friend in general ? I was always following other so I don't really know how to do these simple things alone Thanks everyone. Note : English is not my native language so sorry if I write things weirdly.