I don't see anything wrong with collecting lots of things (particularly books) so long as you have ample room for them and it isn't interfering with your life or the cleanliness of your home. Myself, I have thousands of books. I have custom built floor to ceiling bookcases in the living room, den, etc. The whole thing is lovely. I just love books. Not only do I love to read them, I love the touch, the feel, the smell of them, both old and new. Who was it who said "Books furnish a room"? They do. This sounds a little mean, but I always wonder about people who don't own books. I suppose with young people, the information is all in your computer.
I have an ereader now for travel, but although it satisfies my desire to read, I always wish I had the hard copy. The ereader is nice, especially as my eyesight is getting poor. I can change the font to a larger size. But still.....
I have always collected things. cookie jars, walking sticks, etc etc. Then I get bored with it and give it away or sell it. (Mostly I give it away) The constant is the books. But like I said, they are beautiful, and I do have room for them. Occasionally, I go through them and donate to the library for their fundraising sales. You should surround yourself with the things you think are beautiful and love. Whatever it is.
35 guitars sounds like a lot, but I can picture a wonderful room with them displayed on the wall and shelves of music everywhere. You must have fun with that.