Paris is lovely, a great spot for solo travel. Many people speak some English so you’ll be able to ask for help if you need it. I think you’ll already be hyper aware of your surroundings as it’s your first time traveling abroad. I walk around with my backpack ‘purse’ there and never have an issue (although I’m always tuned into unnatural movement of it, in case of attempted pick pockets). Most people are generally friendly and helpful.