I really enjoy it, but I feel like I'm starting to slow down again
This is how it goes for me and I've been playing for quite awhile. Feels like I stagnate then an "aha! moment" happens and I'm rejuvenated. Eventually I started taking lessons to improve.
Don't bother with sheet music IMO. Tabs are all you need. Learn the major open chords first, they'll get you farther along quicker than anything else. Don't fret (pun intended) if you are learning a song and it doesn't sound 100% the same.
Learning guitar takes some dedication before you feel like you're really getting it. Practice at least 30 minutes a day and it will come to you but it may be months before it sounds like music. As long as you're having fun. I tell people it's like learning to tie your shoe laces. All muscle memory. It was difficult at first but now your hands do it without you having to think about it or even look at it. Soon your hands with form those chord shapes the same way. Good luck!