Is it normal i want to be single?

I've been together with my boyfriend for about a year, it started off just meeting up, drunkenly flirting, then later deciding to fool around, and we kept doing it until we eventually fell into a relationship.

He's a bit older than me (nine years), but he's in his last year of Uni and I've finished compulsory education so it's not like the age gap was too significant.

But it's not the perfect relationship - I'm the type that is very verbally affectionate, likes to have a best friend as well as a boyfriend, whereas he's very independent and will barely talk to me online unless I start a conversation (which every other guy I dated liked to talk online often) and also, he's very non romantic (he doesn't know how to say sweet stuff) and although he can be thoughtful, he's not romantically thoughtful, but rather practically thoughtful.

In my last relationship, I was happy until I got to know new people, and found that I kind of liked other people - which led to an awful thing where I liked someone else and someone else liked me - but due to practicality we could never meet.

At the minute, I've not met very many new people, I'm doing part time work and an online course, and recently, I've got a job that is heavy customer interaction, and when I talk to customers, and sometimes it's flirty, it just makes me realise I miss it.

I'm only eighteen, I love my boyfriend, but I just feel a little restless. I've constantly tried talking to my boyfriend, saying he should initiate sex more (he doesn't say no when I initiate, but he doesn't seem to want to try new things and experiment, whereas at the very beginning we were very sexually charged) and I feel as though he's just not putting in much effort.

I feel like at my age, it's all about meeting new people, having fun, but I really do love my boyfriend, but I also think if I stay, I'd just be settling down too early.

Is it normal to have doubts, or am I just not into the relationship that much?