Boyfriend acting kinda weird

So before we started this relationship we knew each other for a while as he goes to my college and is in one of my classes. We exchanged numbers a few weeks ago& we started texting.. since then it's been non-stop texting, the day we started talking he asked me if i had a boyfriend and he said he thought i found him annoying, he told me he liked me and had his eyes on me since day one. Going into this i was expecting him to be subtle and relaxed about it like most teenage boys (we are both 17) but we went out on a Saturday & he had plans with his friends but decided to go out with them later in the evening as he said he wanted to spend as much time with me as possible. Well spent the whole day together, i really like him and i had fun but while we were at the park he asked me for the password on my phone, i said no and he gave me his phone and password expecting me to give him mine, he took my phone and i tried to get it back but he kept stopping me. I think it's too early for him to be asking me for my password, it was the first day!. All day he held my hand and kept squeezing it really tight, he was constantly staring at me and trying to kiss me. We were lying down in the park just hugging and he tried to kiss me but i moved & he sat on me and held my arms down and kissed me about 4 times. i gave his friend my number to give to him and his friend was joking with him saying it was for him. When he told him he was seeing me on the weekend his friend said " did she mention me" , now he wants us to piss his friend off, i don't know why. since then he kept repeatedly asking if i miss him and saying he misses me he said ' i miss you' 10 times yesterday and kept asking me what i was doing, where i was going and who with. He told me to take care when going home and and asked me if i got home safely. He told me he never wants to lose me and i'm the best thing that's happened to him since he was born, and saying he wants us to last and if we had a child it would look beautiful. Also when we were out he stole something from a shop and said i'd have to get used to it. He tried to get a new phone today so he can always call me when he misses me. He wants to come to my house on Saturday and yesterday we were hanging out after college and i was sitting on his lap and i kept trying to get up because i was getting pins and needles in my leg but he just kept saying " you're not going" he was talking and i must have been looking away and he said to look at him when he's talking to me and he grabbed my face twice and said i'm his property... he also took my phone again during English class as well and when i took it back he took my work that i was doing and my bag..he keeps asking for my password... I really don't understand, this is all kinda new to me i really like him and i don't want to lose him...(sorry for any spelling mistakes)

both too young to be getting into a relationship, it sounds like he hasn't matured at all and is playing mind games with you. Trying to control and manipulate you into feel sorry for him when he says sweet things after being horrible to you

This person has a lot of negative traits for a relationship, of any kind. This person is being quite controlling, wanting your phone password, call you his "property", ordering you look at him when he's talking to you, forcing you head down on his lap etc etc etc. Who is he? Your dad? He shouldn't be doing that. Especially if he "loves" you. To be honest in my opinion these behaviors are very dangerous. He's come into your life and is now trying to control it and be in it permanently. Knowing where you're going, what you're doing, why you're doing it. Trying to get soo far into your life it'll take you from hell and back to get him out of it. I heavily advise not letting it get to that point. Also his STOLE from a shop and his response to you was DEAL WITH IT? I'm sorry but that's heavily out of order. If he can just break the law like that, stealing god knows what, whos to say he won't break the law involving something with you? Since the law clearly doesn't phase him if he can do that. He could abuse you, steal from you, hurt your friends who knows? The law doesn't seem to have an impact on his moral conscience, that's very dangerous. From this persons perspective he probably does think he cares for you and loves you and wants the best for you. However he desires this soo much he's going to control you into submission so that he's always in your life to do this. You do not want that, under any circumstances. His actions are sweet and caring but it's way out of hand. He's heavily insecure. Basically all this in his eyes is too protect you. But in reality that is not the effect it's going to have, it'll make you feel terrible. I advise actually trying to avoid this individual. He's so fixated on you he may not stop this. If you can get him to stop this behavior great! But if not avoid him. Talking to him while he's acting like this will only make the situation worse, he has to stop or you have to stop talking to him. It's the best option really, otherwise this person will have a negative effect on your life.