Doubts?!?

Ok I have not had a serious relationship in a couple of years (to be exact 3-4) I have dated some guys also had relationships with no strings attached. With that being said I’m getting ready to start a relationship with someone but I’m having doubts if I can keep it up and really enjoy it. I’m not sure if I might get bored or just wonder out like in the other past relationship I had (the one with no strings attached)

Could it be that I’m scared of commitment?? Please help this girl out, lol I know it sounds silly but I need advice.