Afraid! Please give me a piece of advice :-)?

Hi! My boyfriend asked me to spend two days in Florence with him during the Easter holidays. I'm afraid to go, because after the bad experience of the last school trip in Wien, I'm afraid to go on holiday without my family. Moreover, maybe I wouldn't be happy because of his presence, maybe I would feel stifled, because I'm too young! But, it's also true that I feel in love and I'm not a little girl, I'm 18 and he is 23 and we've been together for 3 years. So, are these fears too many? Help me please! I need a lot of indipendence from my family, I guess xD