Over thinking or autism ?

I have a 2 yr old turning 3 soon and I’m starting to wonder if he has autism. Yet I doubt myself because of how smart he is and any parents do, am I just over thinking and making up things to “see” things. It’s very difficult to separate normal toddler behaviors from first autism signs and I’m hoping someone here can guide me to what to do next or to tell me I’m that “over thinking parent” anyway, beginning with security blanket he has, he won’t sleep without it. He won’t leave his room without it. He has to have it while he drinks and even to the car or public sometimes. And when he has it in his hands, he does this rubbing motion with his fingers right into the blanket. Almost like he’s rubbing a stain off. He’ll do this as long as he has it in his hands. And he has OCD tendencies like he’ll line up all the cars in one line or one circle. Same goes with animal figures, he separates them by category and puts them by groups ( sea ani. Farm ani. Etc.) he’s very talkative and understanding yet he tends to repeat like a broken record only when he knows what or how he wants it. Not whining way just very plain and repeated. He did used to walk on tipping toes a lot he kind of does now and then still. He hates loud noise of his choosing like he cannot stand to be in loud restaurant but he’s fine at playground with background music and such. He’s very sensitive and very much like being on routines. He does say hi and does talk/play with kids but only lasts minutes and he’s back on his own doing his own thing. He’s very smart. Knows his Abcs. Songs. Numbers. Names of family members. Names of animals, cars, and etc. yet he seems to freak out when I give him the food he loves and can name and knows he eats almost everyday, if I put it on the plate wrong or put obvious “sign” of different things with it, he will literally gag trying to eat it and if I tell him he has to eat anyways then he has this meltdown. Not crying or whining to see if he can get away without eating it but very much anxiety-stressed meltdown. I’ve done time outs/punishment (no dessert) / talking him out. I’ve only done so thinking that this is his terrible twos or “bad day” but lately I’m becoming confused and concerned. As smart as he is, and how much he talks, he should be able to tell me yes or no. Anything that describes his feelings but he shuts down. Literally! As far as eye contact I’m not sure how to tell. I tell him to look at me when I’m calming him down or tell him what I need him to do like clean up or be focus. He does for a moment and his eyes wonders off but when he brings me something, he’ll tell me what it is and he looks up at me then he goes. He has very short attention span. I still to this day have very hard time reading a book or color with him. He absolutely won’t sit to read any book. He’ll color or “write” but he’ll fill the space/paper with one color and one pattern. He loves LEGOs. And he actually builds it. He loves play doh. Sand. Puzzles. He eats well, sleeps well, potty trained and hes very content. He’s independent and self occupied. Thank you for reading and hope to hear from any of moms on here. Good and bad.