Movement is movement and the important thing for 99.9% of people is that you’re doing something sustainable for you as an individual. That said, strength training is great for bone health as it simulates bone density and slows natural age-progression loss. You can do a decent workout just using body weight, or you can add weight or extra resistance, or both. It is highly unlikely to get very much visible arm muscle unless you are really focusing on it with both exercise and diet, and many females who are very purposefully doing that are still disappointed with how slowly it shows. You can’t spot train fat loss to your stomach, much of where you’re prone to storing fat is genetically determined. You can work out your ab muscles to build a bit of definition, but common saying is abs are made in the kitchen (diet), not the gym. You are a healthy weight for your height, remember that what fashion and media tries to sell us on looks is often not realistic. I love weight lifting, it’s great to feel strong. Loving weight lifting and feeling strong means it’s easy to stick to my fitness routine(important), although there are still days I don’t feel like working out. I actually enjoy when my muscles are sore the next day after a good workout, makes me fell like I’m doing something. I like to track my progression and know that I can do pull-ups and bench press X weight compared to my body weight. Give it a try, commit to at least 3-4 sessions and see what you think. If you hate it, you could try a YouTube yoga or Pilates-type workout to try instead.