Is it normal my dad picks my lock or barges into my room if i don't respond

My mom used to be like that, and it made me suicidally depressed. Please try your best to get out of that situation.

Your dad is emotionally abusive, belive it or not. What he's doing is called, "gaslighting," which means to purposely drive a person insane in some way. Abuser go about gaslighting their victim in their own way from invading privacy, asking crazy questions they expect a specific answer for, or putting unrealistic expectations on you and nitpicking/berating. The list goes on.

This is not because you're a loner, a virgin, or anything. You're fine, and your dad was probably like this long before you were born. However, don't let your dad make you fall into such a deep depression that you can't function, because that's what abusers want. Abusive parents never want to see their children do well.

Solution? You got to get out of there. Abuser can be in any form of relationship, but I feel the worst one are parent-child, because the child can't simply walk away, but have to endure it until their old enough to break away. Here are your options: Either do well in school, and get a scholarship to a far away university. Or get a good paying job that will allow you to make enough to live on your own.

It sounds like he is just worried about you. Maybe he has suspicions that you are doing something self destructive. I wanted to be locked in my room alone when I was younger too. Now I am the parent of an 11 and 14 year old. I have been on both sides of the fence. Is there a possible reason why he may feel the need to "check on you" all the time? If there truly is no reason, then he is probably just overprotective. These are crazy times to be a parent. Drugs, predators, dumb decisions teenagers make..... the list goes on.

Are you female ?
How old are you ?

Sounds like my father (not you step dad in case you read it).

1. Get the lock changed as only a shitty lock can be picked with a screwdriver. An average lock needs two strong and thin rods where one of them should be bent to rotate the shaft.

2. Take a stand and tell your dad that he can't barge into your room without your permission unless you are seriously injured or require medical assistance. If he assaults you, talk to police.

3. If you are old enough, join a college in a different city.

Taking stand isn't an easy idea. I took one, my father flipped, assaulted me and my mother, kept punching my mother till my neighbor shot him with a salt round.
I had 4 stitched in the back of my head. My step dad is a good person but the trauma kept me away from him for years.

I also feel like you are very depressed, complicated by his overbearing control issues. HOWEVER- you dont say your age, but his house, and his rules, he may think you are doing things behind locked door. Leave your door open a few times and see if any difference. Maybe he's afraid of you leaving him and him being alone. What about going to visit your older sister, will she let you stay with her awhile and see how dad reacts ?

I was in my room after a shower with nothing on.I was bent over looking for some underwear.My dad came in and told me my ass looked delicious,laughing as he closed the door.

You could try masturbating as he tries to come in as a deterrant to get him to not want to open your locked door, though that could also result in less savory outcomes. Yeah blah blah his house but for somebody to behave that way to their kid can only hurt to damage their relationship with you for when you're older.