Does life ever truly get better?

Im 18 years old and graduating high school soon. I work a lot (about 40 hours) due to a short high school schedule that allows me to work longer hours. I feel like I grew up way too quick. I look forward to payday every week like its my biggest life award and focus so much on saving my money. Adults tell me I am good at saving money and not to worry, but I feel like I'm missing out. Many people I know seem to be looking their best and spending their money while they're young. Why can't I? I don't have as many friends as I used to, I'm don't like going out as much anymore, I spend my free time on my phone or researching. Nothing that's productive! Is this the rest of my life? I'm in such a deep-set mindset by now. I can't break my bad habits and I can't fix my issues. I can't get my life together and find a balance between working/school and taking care of myself. I also have self esteem and confidence issues. Is life just going to keep going downhill while I can't help myself out?