Neural network model from Keras not increasing in accuracy

I'm trying to make a predictor model for identifying therapeutic peptides based on their word2vec vectors. The dataset has 100 positive and 100 negative examples. I've already embedded the peptide sequences with Word2Vec and am trying to train my neural network. However, the accuracy remains constant at 51.88%.

What I have tried: Changing the loss function(to binary cross entropy), number of nodes in each layer

Here is my code:

import sklearn
a = sklearn.utils.shuffle(arrayvectors, random_state=1)
b = sklearn.utils.shuffle(labels, random_state=1)
dfa = pd.DataFrame(a, columns=None)
dfb = pd.DataFrame(b, columns=None)
X = dfa.iloc[:]
y = dfb.iloc[:]

X_train, X_test, y_train, y_test = train_test_split(X,y,test_size=0.2, random_state=300)
X_train = np.asarray(X_train)
X_test = np.asarray(X_test)
y_train = np.asarray(y_train)
y_test = np.asarray(y_test)
y_train = y_train.astype(np.float32)
y_test = y_test.astype(np.float32)

## train data
class trainData(Dataset):
    
    def __init__(self, X_data, y_data):
        self.X_data = X_data
        self.y_data = y_data
        
    def __getitem__(self, index):
        return self.X_data[index], self.y_data[index]
        
    def __len__ (self):
        return len(self.X_data)


train_data = trainData(torch.FloatTensor(X_train), 
                       torch.FloatTensor(y_train))
## test data    
class testData(Dataset):
    
    def __init__(self, X_data):
        self.X_data = X_data
        
    def __getitem__(self, index):
        return self.X_data[index]
        
    def __len__ (self):
        return len(self.X_data)
    

test_data = testData(torch.FloatTensor(X_test))


EPOCHS = 100
BATCH_SIZE = 2
LEARNING_RATE = 0.0001

train_loader = DataLoader(train_data, batch_size=BATCH_SIZE, shuffle=True)
test_loader = DataLoader(test_data, batch_size=1)

# make mode
model = Sequential()
model.add(Dense(64, activation='relu', input_shape=(4,)))
model.add(Dropout(0.5))
model.add(Dense(16, input_dim=1, activation='relu'))
model.add(Dropout(0.5))
model.add(Dense(12,activation='relu'))
model.add(Dropout(0.5))
model.add(Dense(1,activation='sigmoid'))
model.summary()

model.compile(loss='binary_crossentropy',optimizer='adam',metrics=['accuracy'])

history = model.fit(X_train, y_train, epochs=1000, batch_size=64)

Let me know if you have any thoughts!