Overthinking...

Is it me or does anyone else overthink so much they doubt everything. Yes I’m 17, I’ve gone through things a kid or anyone should go through. I don’t take people leaving me so easily and last year in May my boyfriend broke up with me just before hitting 6 months together. I didn’t feel like I could ever be happy again, I put everything into him even when I’m not in the best position. It was a long distance relationship and I made the effort to go see him every weekend I could. No again I did t think I could be happy ever again or have the same feelings I had for him for anyone else. It’s now almost been a year and I’ve talked to some guys but it never worked out I just could relate but recently this guy and I started talking and he’s so amazing it’s almost too good to be true and I don’t want to doubt it but my mind is so messed up. He’s so sweet and just everything about him is great. The doubt is that I’m insecure about how I am and what I look like, and he’s cute and so nice. I moved from California to Texas now and I’ve had him on Snapchat for a while, and we would talk but I never got the vibe he liked me or anything until a few days ago. He wanted to get to know about me and my interest. He started screenshotting selfies I’d send to him and stuff but idk how to approach that I’m starting to have feelings for him because he makes me feel like I worth and I get happy whenever I see his name in my phone... I need advice:/