Gonna try to offer some tips
First off.... those are the goofiest looking gloves I've ever seen.
Ok, and now to try to help.
1. Your footwork looks very very stiff. From the little I could see of your legs and hips they looked tight and stiff, loosen up a bit, get a bounce.
2. Like another poster mentioned keeping your hands up is great until you block your own lines of sight. Keep them high enough to protect your jaw and so they are close enough to move to block hooks and such. Otherwise you are blinding yourself.
3. NEVER DROP YOUR HANDS. Those uppercuts you were throwing will get you destroyed. You drop the hand and come from way down low. Any idiot with one good eye is gonna see your jaw and break it, since you kindly leave it open that way. Upper cuts are not like the ones you see in movies and video games, you dont ever drop your hand to your hip and swing, unless the other guy is like half dead already.
If i could explain a better way to do them easily I would but I find it easier to show folks, and I dont have a way to do that right now. So for now i would suggest not practicing them yet since practicing anything the wrong way just makes for bad habits.
4. Snap your hands back faster. Just something to work on throw the strike and snap the hands back fast. Keeps you from gettin caught and will add a lil more bang to the punch comin from the opposite side. jab/cross cross/hook its a push pull system.
Those were just a few things I saw. I'm not a terribly good striker myself, but i've been training MT for almost 3 years so i know a lil bit.
One thing i would suggest. Since you mentioned you cannot afford a gym membership, I'd just go out and start makin friends with guys who do train. Or try to get a part time job or something helpin out at a gym with cleaning or something and then get to know some folks and ask them. Havin a trained person help you out in person beats anything the internet can give ya.
Just my two cents