My girlfriend truly loves me but I can't commit?

My girlfriend who was my ex coworker truly loves me and I love her too. We were coworkers for 2 years before slowly fell for each other. I've always thought I would be alone forever and actually was okay with it until she came around. Now, she loves me and wants to be with me. But I'm not sure if I should commit long term or continue my path of wanting to be alone. I know being alone now is different than when I'm 50. But what do you think? I know it may seem dumb to let go of someone who loves outside of outside my family. But would appreciate your opinions

My girlfriend truly loves me but I can't commit?
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